Corymbia citriodora

PEST

   NAME

     Steelblue Sawfly

     Perga species

   ORDER

     Hymenoptera

   FAMILY

     Pergidae

Description of the Pest

Adult females are steel blue in colour, with yellow antennae and legs, growing up to 20mm long, with 40mm wingspans. The insect is called a "sawfly" because of the sawing action of the ovipositor. The yellowish-brown larvae have chewing mouth parts.

The larvae are called "spitfires" because, when disturbed, they bend back their bodies and exude a strong, eucalyptus-scented liquid from their mouths. This exudate contains concentrated eucalyptus oil, which can cause severe eye irritation. The non-feeding adults are seldom seen. Sawflies have a complete metamorphosis, pupating in cocoons in the soil for months or years.

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Appearance of the Pest

During the day, sawflies larva congregate in clusters, separating at night to travel and feed on the foliage of the host plant.

Period of Activity

Caterpillars appear in spring through summer.

Susceptible Plants

Eucalypts, especially E. camaldulensis, E. blakelyi, E. melliodora, and E. pauciflora and others.

Damage Caused

Generally the larva eats the surface of leaves when young, but as they develop they eat large pieces leaving only the mid rib. They tend to feed on the terminal shoots, and heavy infestations can defoliating young trees.

Cultural Control

Clustering larvae may be hosed or knocked from branches, falling to the ground where they can be squashed under foot or attacked by other predators. During the day when the larvae congregate they can be collected and disposed off. In small infestations they can be picked by hand and destroyed.

Biological Control

The exudate causes most birds to avoid the larva, although cockatoos remove the head and oil gland prior to consumption. They are also eaten by lizards and frogs or attacked by parasitic wasps.

Chemical Control

Affected plants can be sprayed using Maldison or Carbaryl, this is only possible for small trees.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Coccid Galls

     Various Coccid Gall Species

   ORDER

     Hemiptera

   FAMILY

     Coccidae

Description of the Pest

Small, sap-sucking insects related to mealy bugs and scale. The feeding of the pale, pinkish-white larvae stimulates the host plant to produce a gall, in which the larvae continue to feed and mature. Different species may have characteristic-shaped galls, and male and females may produce different shaped galls. The adult male emerges as a small fly from the gall via a small tunnel; the female matures and dies without leaving the gall.

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Acorn Gall (Apiomorpha conica) female produces a smooth, roughly oval-shaped gall on the twigs and the smaller horn-shaped galls of the males appear on the leaves.

     Acorn Gall, Male

Four Horned Gall (Apiomorpha munita) female produces a roughly four-sided, four horned gall and the male galls appears in horn-like clusters along the twigs.

Appearance of the Pest

Rounded, cylindrical or horned, woody galls appear singly or in clusters on the leaves and twigs.

     Galls on Eucalyptus

Period of Activity

Galls may appear all year round.

Susceptible Plants

Allocasuarina species are susceptible to the Casuarina Gall (Cylindrococcus species) which contains a single small pinkish sap sucking insect that forms galls with overlapping scales up to 15mm long with an acuminate apex. The galls are very simular looking to the capsules of the plant. This pest may also be found on Casuarina species.

Eucalyptus species are commonly attacked especially in temperate to tropical regions; Casuarina and some Melaleuca species may also be affected.

Turf Grasses are attacked by the Felted Grass Coccid (Antonina graminis). It is also known as the Leaf Mite or Grass-crown Mealybug and forms a small whitish sherical body that has a dark spot (eye) and when crushed releases a purplish fluid.

It is commonly found on Cynodon species (Couch), Pennisetum clandestinum (Kikuyu), Stenotaphrum secundatum (Buffalo) and Digitaria didactyla (Blue Couch).

Damage Caused

The appearance is unusual but not unsightly. No damage is usually caused.

Control

Not usually required.

PEST

   NAME

     Borer (General)

     Various Borer Species

   ORDER

     Various

   FAMILY

     Various

Description of the Pest

Generally the larvae bore holes into the heartwood, sapwood or down the centre of twigs. These tunnels may be small or large, deep or shallow and when they emerge from their tunnels at night, they feed on the surrounding tissue. Entrance holes may be covered by a layer of chewed wood fragments ("frass"), silk webbing or exposed and the tunnels may be solitary or form galleries. Certain species attack only twigs and young shoots, while others attack the trunk or roots.

Fruit tree moth borer damage

The adults female of a fruit tree moth borer normally deposits eggs in damaged areas of the bark or where there is and existing active site. The larvae vary but generally they are creamy to brown, thick soft grub-like reddish brown, and up to 40mm in length.

The adults are white, satiny moths with 40-60mm wingspans with their black abdomens fringed with orange-brown hair or beetle lava that has been deposited in the bark or twigs then tunnels the host.

American Plum Borer (Euzophera semifuneralis) lava is pinkish white to brownish green and attacks the inner bark and cambium region of the tree causing premature death. It is normally found on Platanus orFraxinus species and may also infest many species of fruit trees.

Apple Root Borer (Leptopius squalidus) female adult is a weevil to 20mm long and feeds on the leaves and the plump, legless grub-like lava feeds on the roots of the same host forming tunnels in the deep roots. It is commonly found on Acacia and Eucalyptus species damaging the anchorage of the plant.

Banksia Borer (Cyria imperialis) adult is a black beetle with yellow markings on its wing covers growing to 15mm long. The thickish legless lava is white, tapering from the head and forms flattened tunnels into the heartwood of the host.

Bronze Birch Borer (Agrilus anxius) is a bronze coloured beetle up to 14mm long and lays eggs in crevices in the bark. The legless white larva grows to 20mm long and feeds on the sapwood girdling the branch with flat irregular galleries.

Cedar Tree Borer (Semanotus ligneus) is a black beetle with orange and red markings on its wing covers and grows to 12mm long. The larva feeds on the sapwood of Sequoia, Thuja species and Pinus radiata with curved tunnels that may girdle branches.

Chestnut Borer (Agrilus bilineatus) adult is a tiny slender, blackish green beetle up to 8mm long emerging during spring. The small white larvae have a flat head and are up to 15mm long, forming galleries under the bark of Quercus species.

Cypress Bark Beetle (Phloeosinus cupressi) adult is dark brown with a blackish head, oblong in shape up to 3mm long. The tiny beetles tunnels under the bark of the host and deposits eggs. After hatching the tiny 4mm long, legless larvae bore into the heartwood damaging the tree. After they pupate in the tunnel they emerge through small round holes, commonly many together on the trunk. Damaged trees show signs of browning and dead leaves in the upper branches or falling damage twigs. Cupressus species are particularly vulnerable to attack.

Deodar Weevil (Pissodes nemorensis) is brownish with an obvious snout feeding on the cambium layer and deposits eggs in the bark of the leader and branches. The white lava tunnel the wood eventually killing the leader.

European Corn Borer (Pyrausta nubilalis) is a small moth that lays up to twenty eggs on flower buds. The young flesh coloured larvae mature to a reddish brown and each of its segment has four, spined dark spots.

Elephant Weevil (Orthorhinus cylindrirostris) is a grey or black insect up to 20mm long and lays eggs in the bark near the base of stressed trees. The larva tunnels its way through roots or trunks depositing frass as it goes, then emerging from a second round hole. The adults eat strips from the leaves, normally not bothering the plant.

Elm Borer (Saperda tridentate) adult is a greyish beetle with red bands and black spots on its wing covers and is up to 12mm long. The eggs are laid on the bark and the whitish lava tunnels into the bark and sapwood where it overwinters. It is normally found on Ulmus species.

Iris Borer (Macronoctua onusta) is born from a grey moth with a wing span up to 30mm across, and lays eggs that overwinter in old leaves and debris. As the leaves emerge the eggs hatch entering the leaves at the base, visually forming tunnels and growing to 30mm long. In the later season flower buds may be attacked. Both flowers and leaves eventually turn brown and die.

Lilac Borer (Podosesia syringae) adult is a wasp-like moth that produces pure white lava with a brown head that are up to 25mm long. It initially feeds in the sapwood causing wilting before tunnelling the hardwood making the branches brittle. Evidence of frass is found at the tunnel entrance and secondary fungal attacks infect the holes. Normally found on Syringa species.

Locust Borer (megacyllene robiniae) adult is a black beetle with golden spots, up to 20mm long and produces a small larva that tunnels galleries into the sapwood causing a blackish discolouration. Robinia species are normally attacked.

Mottled Borer (Cryptorhynchus lapathi) attacks Salix species. The adult beetle is black up to 10mm long and the lava bore into the surface of the stem causing swollen growth. Salix species are attacked.

Murry Pine Borer can be two species (Diaoxus erythrurus) and (Diaoxus scalaris). The adults are glossy green-brown beetles that are up to 20mm long and the white grub-like lava is legless, tapering from the head. They tunnel into the sap or hardwood of the trees forming connecting galleries causing ringbarking and creating brittle branches, commonly fond on Callitris species.

Peach Borer (Sanninoidea exitiosa) is a larva that tunnels roots causing gummosis that is mixed with frass at the crown just below soil level. The affected Prunus species produce yellowish leaves and grows poorly. There is another borer, Lesser Peach Borer (Synanthedon pictipes) which attacks any part of the plant from the trunk to the branches and is found on several Prunus species.

Puriri Moth (Aenetus Virescens) a New Zealand short lived moth that grows with a wing span of over 100mm (4in) wide laying eggs on the forest floor at night during spring. The caterpillars grow  to 100mm long feeding on leaves and  then ascending into the trees and entering the cambium layer up to 150mm deep forming a characteristic '7'-shape burrow that is concealed by frass. The caterpillar may live for 7-years before pupating and collectively they ring bark branches or trunks causing dieback.

Many New Zealand plants including Nothofagus solandri, Pomaderris spp.and ornamentals such as Quercus spp. Betula pendula, Salix spp. Populus spp. Acer spp. Citrus limon and Paulownia spp. are attacked. Control is difficult and generally the plants tolerate attack.

White Pine Weevil (Pissodes strobi) lava feed on the inner bark and sap wood of terminal shoots causing ringbarking and death of the shoot. The reddish brown beetle up to 6mm long is mottled in white and emerges during early summer then lays yellowish lava that are up to 9mm long.

Scribble Moth (Ogmorgraptis scribula) is a grey moth up to 0.4mm wide and produces a cream to brown larvae that is also about 0.4mm long and tunnels in the bark causing a scribble effect. This normally has no detrimental effect on the tree.

Spotted Hemlock Borer (Melanophila fulvoguttata) adult is a colourful metallic beetle with yellowish red spots on the wing covers and lays eggs in cracks in the bark. The white lava is up to 14mm long and forms galleries in the bark and sapwood of the host.

The large Swift Moth and Wood Moths can have a wing span up to 250mm wide and produce large larva that are grub like up to 150mm long, some with horny plates on the thorax. These larvae bore tunnels that are up to 30mm across straight through the heartwood of the host plant. The larvae may live in the tunnel for up to five years before pupating.

Red Cedar Bark Beetle (Phloesinus dentatus) is a small beetle up to 3mm long and lays its larva in excavations in the bark. When the larva emerges they bore galleries in the bark and tend to be more prevalent in stressed or recently transplanted plants.

Vegetable Weevil (Listroderes difficilis) is found during cooler weather (spring or autumn). The adult brown beetle up to 19mm long with a "V" mark on its back and the eggs are laid in the soil around the base of the host plant. The cream coloured lava emerges in spring after rain and feed on the lower leaves forming irregular holes or chewing holes in stems. The lava also feed on fleshy roots boring holes into carrots. Both the adults and lava cause damage, feeding on the plant during the night and resting at the base or under ground during the day. The lava pupates in the soil over winter.

Wattle Web-covering Borer (Cryptophasa rubescens) adult is a satin coloured moth that is up to 50mm across and deposits green fleshy lava that is up to 35mm long. The lava forms shallow tunnels in the bark and sap wood of the host and camouflages it with chewed wood and faeces that is webbed together. Commonly seen attacking the branches on Acacia species.

Life Cycle

These insects have normally have a Holometabolous life cycle. But some borers such as Termites have a Hemimetabolous life cycle.

Eggs are laid singly or in groups, in damaged areas of the bark and branch. Larvae shelter in tunnels they create in the wood and some species may take many years to pupate and emerge as an adult. This may take place in live or dead wood.  Other species such as Corn Borer can have up to two generations per year.

Termites and their damage

Distribution of the Pest

Borers are found throughout the world with many species found in Australia both on the coast and inland.

Period of Activity

Varies with the insect concern. Many larvae can be active for many months. Termites are active all year.

Damage Caused

Most damage appears on branches or trunks where the larvae feed on the soft tissue and extensive feeding may cause ring-barking. Normally plants survive borer attack but repetitive attack will cause the death. Certain species are a serious pest in plantations or monocultures such as the Pine Bark Weevil, and the Sirex wood wasp.

Typical borer damage by a moth larva

Chestnut Borer feeds on the sap wood ringbarking large branches and overwinters in the tunnels.

Corn Borer feeds on flower buds and leaves resulting in there death, after which the larva tunnel down the stem causing wilting. There are many crop plants and ornamentals that are affected by this larva.

Swift Moth and Wood Moths weaken trees by boring large tunnels through the branches that may not be noticed until holes are cut through the bark during emergence.

Iris Borer damages leaves to turn brown and wilt, flowers also turn brown and with the aid of a bacterial rot, collapse and die. This damage may be extended to the flower stalk.  

Stem Borer (Papaipema nebris) is a small lava to 12mm long, and attacks many garden plants including Lilium, Aster, Alcea and Phlox species

Borer Damage          Resin oozing from a trunk

Susceptible Plants

There are many plants that are attacked by these pests including Banksia, Callistemon, Melaleuca, Lagerstroemia, Jacaranda species, and flowering stonefruit. Eucalyptus, Acacia species and many ornamental such as Acer species. Plants that are stressed, are particularly venerable.

Acacia and Eucalyptus species are attacked by Swift Moths and Wood Moths.

Acacia species are susceptible to attack from the Wattle Web-covering Borer (Cryptophasa rubescens), which weakens and causes die back of branches.

Acer platanoides is attacked by the Leaf Stalk Borer (Nepticula albostriella) that tunnels into the petiole of the leaf turning it blackish and also attacks the fruit.

Acer saccharinum is attacked by the Petiole Borer (Caulocampus acericaulis) which tunnels in the petioles. It generally attacks the leaves on the lower branches causing them to fall.

Acer species may also be attacked by several borers including the Flat Headed Borer (Chrysobothris femorata), a 25mm long lava of a coppered coloured beetle, that tunnels galleries under the bark girdling the trees The Sugar Maple Borer (Glycobius speciosus) which girdles branches killing them and the Leopard Moth (Zeuzera pyrina) lava that tunnels large holes into branches making them structurally weak. This lava can grow to 80mm long and 12mm thick overwintering in the tunnels.

Banksia species are attacked by the Banksia Web-covering Borer (Xylorycta strigata) a greenish lava up to 40mm long that tunnels down the centre of branch tips. The entrance is covered in silken web littered with faecal material and causes the death of the branchlets.

Betula and Populus species are attacked with the Bronze Birch Borer (Agrilus anxius) and heavy infestation may kill the tree. Populus species are also attacked by the Poplar Borer (Saperda calcarate).

Brachychiton species are attacked by the Kurrajong Weevil (Axionicus insignis) the lava of this plump greyish weevil is white and legless, entering the plant through wounds forming rounded tunnels that may girdle the tree, killing it.

Carya species are attacked by the Painted Hickory Borer (Megacyllene caryae). The adult dark brown beetle has obvious zig zag lines on its wing covers and the lava is cream coloured, both up to 20mm long. The lava tunnels the sapwood of living trees causing ring barking and also tunnels dead trees.

Cornus species are attacked by several borers such as the Flat Headed Borer (Chrysobothris femorata) and the Dogwood Borer (Thamnosphecia scitula).

Cupressus species are attacked by the Cypress Bark Beetle (Phloeosinus cupressi) causing the branches to turn brown and die off from the top or causing the leaves to wilt. On first indication of infestation selective prune off damaged areas or remove the tree.

Hakea sericea and other Hakea species are attacked by the Web-covering Borer (Neodrepta luteotactella). The larvae bore into the twigs and fruit forming a small covering of frass. This insect also infects Macadamia species. Hakeas are also attacked by several other web-covering borers.

Hakea sericea

Pinus and Picea species are attacked by the White Pine Weevil (Pissodes strobi) in the northern hemisphere.

Samanea saman is attacked by the borer (Xystrocera globosa) which chews into the sap wood of stressed trees and can cause serious damage.

Sorbus aucuparia is attacked by the Round Headed Borer (Saperda candida) which forms galleries in the trunk at ground level, forming round holes in the bark.

Tilia species are attacked by the European Bark Borer (Chrysoclista linneela), which feeds on the bark and thew Linden Borer (Saperda vestita) that attacks the base of the trunk or roots.

Tsuga species are attacked by Spotted Hemlock Borer (Melanophila fulvoguttata).

Vaccinium ovatum is infested by the Azalea Stem Borer (Oberea myops). The yellowish lava of this beetle bores into the tips of stems during the flowering period and is up to 12mm (½in) long. It is also commonly found on Rhododenron species.

Control

Cultural Control

Larvae may be destroyed after exposure by pulling away the covering pad of frass, or by pushing a length of wire into the tunnel. Damaged branches may be removed. Improve the culture by feeding and watering the plant.

Frass due to the Fruit tree moth borer

Biological Control

No effective biological control though certain species of trees exude gum or resin sealing the holes and limiting the activity of the larvae or causing its death.

Chemical Control

There is no satisfactory chemical control most borers of live wood.

Note

It is your responsibility by law to read & follow the directions on the label of any pesticide

PEST

   NAME

     Longicorns, Long Horn Beetles

     Various Longicorn Species

   ORDER

     Coleoptera

   FAMILY

     Cerambycidae

Description of the Pest

This is a large group of beetles with over 1,000 species that commonly have two long and conspicuous antennae and square shoulders. They may be large or small, dull or brightly coloured beetles. The creamy-white fleshy lava has reduced legs and taper from the thorax. Both the Lava and adult beetle has chewing mouth parts.

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Appearance of the Pest

The adults lay eggs in wounds or in damaged areas by active borer larvae. The Larvae bore large circular tunnels in the sapwood for many months, which become packed with frass. The damage is evident with cracked bark, surrounded by sawdust and the appearance of gum oozing out of the wound.

Some species ringbark twigs or trunks and the larva pupate in the plant.

The adult emerges from 'emergence holes' and may chew bark or foliage but generally the damage is insignificant.

Auger Beetle (Bostrycnopsis jesuita) is another insect that produces a tunnel boring, plump white larva. The adult grows to 18mm long and its thorax forms an outgrowth that extends over its head making the beetle to always look down.

Pittosporum Longicorn (Strongylurus thoracicus) is brown with white spots on either side of the thorax with long antenna and is up to 30mm long. It lays creamy legless lava that feed on the sapwood of small branches in Pittosporum species by forming rounded tunnels.

Twig Girdling Longicorn (Platyomopsis humeralis) is a dark coloured beetle with anatine the same length as its body up to 20mm long. The wing covers may have stripes or dots and the mandibles are strong arranged at right angle to the body. It feeds on bark forming rings around branches or small twigs.

Period of Activity

The adults are active from spring to summer and are found throughout Australia from tropical to temperate regions.

Susceptible Plants

Many ornamental and Australian native trees, shrubs or climbers, including Eucalyptus, Pittosporum, Ficus and Vitis species. The larva also attacks recently fallen timber or existing dead plants.

Banksia species are attacked by the Banksia Longicorn (Paroplites australis) which is a reddish brown beetle to 50mm long with equal length antennae and produces a yellowish fleshy (grub-like) lava, that is legless and tapers towards its tail. It tunnels into the hardwood and can cause severe damage.

Eucalyptus are attacked by the Giant Longicorn (Eurynassa odewahni) which is a large beetle up to 80mm long with equally long antennae and produces a plump legless white (grub-like) lava, that are ribbed and tapers towards its tail.

Grevillea robusta, Melia azedarach and Brachychiton populneus are attacked by the Auger Beetle larva.

Damage Caused

The larva eats away the sapwood and may tunnel deep into the timber creating open wounds on the trunks and in some cases ring barking the plant. Certain species graze only on the bark and associated wood such as The Twig Girdling Longicorn and the result of the damage is not evident well after the insect has moved on. Branches that have been attacked are weakened and snap off during high winds.

The Auger Beetle eats circular holes through the sap wood and heart wood reducing the structural strength of the tree.

Cultural Control

Stressed plants are commonly attacked and action should be taken to invigorate the plant with additional watering and fertilising. It may be possible to kill the larvae with a piece of wire and areas that have been damaged should be treated with tree surgery techniques to mend the wound.

Biological Control

Beetles and larva are eaten by birds and lizards but are not an effective control.

Chemical Control

There is no effective chemical control.

PEST

   NAME

     Beetles (General)

     Various Beetle Species

   ORDER

     Coleoptera

Description of the Pest

There are many different types of beetles both adult and larvae feed and have chewing mouth parts.

Agave snout weevil (Scyphophorus acupunctatus)
The Agave snout weevil or sisal weevil is a beetle up to 15mm long. It has a dull brownish-black body with a long protruding snout and chewing mouth parts. The adult female lays eggs at the base of the leaves where the hatching larvae feed on the succulent centre of the leaf with their chewing mouth parts and cause significant damage. Decay microbes then entre through the wounds and cause the plant to die by collapsing from the base.

                  Brown (Scarb) Eucalyptus Beetle

Brown Eucalypt Beetle (Lepidiota rothei) adult is brown with hairy legs and grows to 20mm long. It has chewing mouth parts and feeds on the leaves, sometimes swarming and stripping the host tree. The lava is cream coloured curl-grubs that feed on the roots of the tree. The feeding habits of this beetle are very simular to the Christmas Beetle (Anoplognathus species), eating new shoots and leaves to the mid rib, commonly attacking Eucalyptus species.

European Bark Beetle (Scolytus multistriatus) female adult is reddish up to 3mm long and lays its eggs in tunnels in the sap wood and the emerging lava tunnel through the bark forming tiny holes. This beetle is regarded as a main transmission source for Dutch elm disease that infects Ulmus species.

European Willow Beetle (Plagiodera versicolora) is metallic blue up to 4mm long and overwinters in the bark. During spring the yellowish eggs are laid and the emerging lava skeletonise leaves by feeding on the underside. There can be two generations per year and attack Salix species.

Fig Leaf Beetle         

Fig Leaf Beetle (Poneridia semipullata) is a dull brown adult has a reddish brown head and growing to 12mm (¼in) long with prominent antennae. It deposits up to 50 eggs that are in groups on the underside of the leaf. The yellowish spiny larvae are small and appear as sawdust on the leaf. As they mature they turn blackish and grow to 12mm (¼in) long, widest at the head.

It prefers coastal tropical to warm temperate regions and both adult and larvae feed on the leaves. The larva graze in groups skeletonising the leaves and making plants look unsightly.

Figwort Weevils generally the adult beetles are normally black to greyish white, up to 4-5mm long with one or two black circular marks where the wing cases meet. The larvae are yellowish to brown grubs with black heads up to 6mm long and have a slimy texture.

The larvae pupate in spherical cocoons that it spins and is attached to the host stems. The cocoon resembles the seed pods of Scrophularia species (Figwort). Adults overwinter in leaf litter or the soil emerging during spring and lay eggs on the host plant. There is normally two generations per year.

The larvae feed on leaves by grazing the surface of the leaf eating the epidermal layer. The leaf turns brown, shrivels and dies. Many plants are susceptible, including Hibiscus, Dahlia, Vitis species and avocados, potatoes, sweet potatoes, rhubarb, and various weed species.

   Paropsis species adult and larvae    

Leaf-eating Beetles in the Chrysomelidae family are found throughout the world with over 3,000 species in Australia. Generally small smooth and colourful, globular or flattened up to 15mm in length with antennae one third the length of the body. Normally adults and larvae feed on the living tissue of the leaves. There are many sub-families including Sagrinae containing the larges species, Bruchinae containing larvae that eat seeds and the larges subfamily Chrysomelinae contains many species such as Paropsis species. These beetles are characteristic dome shape and are commonly seen on Eucalyptus species.

Mountain Pine Beetle (Dendroctonus ponderosae) is a dark brown to blackish adult beetle up to 7.5 mm long. There are 4-larval stages that include a white larval with no legs that appear from vertical egg galleries and mature larval produce oval pupation cells towards the end of the tunnels in the tree. They emerge from small openings at the tunnel end as adults. This pest affects millions of hectares of forest in North America and Canada including many species of Pinus. It normally attacks older weaker trees but under ideal conditions it attacks healthy trees. Pinus albicaulis has become endangered due to the actions of this species. Numerous beetles can attack a single tree and the larval attack on the cambium layer can be accompanied with a fungal attack such as the Blue stain fungi (e.g. Ceratocystsis and Ophiostoma spp.) causing death of the tree. Symptoms include the needles in the crown wilt then turn orange-red for many months then become brown before falling to the ground. Pitch tubes can be located towards the lower part of the tree and consist of frass and resin.

Staghorn Beetle Damage

Staghorn Beetle (Halticorcus platyceryi) is a small rounded beetle that is black with four dull red spots on the wing covers. It has pinkish lava and both larvae and adult feed on the epidermal layer of fronds leaving small brownish sunken areas.

Wattle Blight (Paropsis orphana) adult is a light green oval-shaped beetle with white stripes on its wing covers up to 6mm long. The small lava has a tapering shape and both adult and lava feed together in groups on the surface of Acacia species leaves turning them brown.

Vegetable Weevil (Listroderes difficilis) is found during cooler weather (spring or autumn). The adult brown beetle up to 19mm long with a "V" mark on its back and the eggs are laid in the soil around the base of the host plant. The cream coloured lava emerges in spring after rain and feed on the lower leaves forming irregular holes or chewing holes in stems. The lava also feed on fleshy roots boring holes into carrots. Both the adults and lava cause damage, feeding on the plant during the night and resting at the base or under ground during the day. The lavae pupate in the soil over winter.

Life Cycle

This insect has a Holometabolous life cycle, i.e. it has a larval and a pupal stage.

Distribution of the Pest

Beetles are found world wide.

Period of Activity

The beetles are active from spring to mid summer preferring the warmer weather.

Susceptible Plants

The beetles attack many species of trees, shrubs, ferns and small plants as in potted plants in nurseries.

Anemone and Clematis species are attacked by the Black Blister Beetle (Epicauta pennsylvanica) which eats the leaves and flowers.

Callistephus species are attacked by the Asiatic Garden Beetle (Autoserica castanea) that chews on the foliage at night and hides in the soil or around the base of the plant during the day.

Carya species are attacked by the Bark Beetle (Scolytus quadrispinosus). The tiny adult beetle is brown up to 5mm long and the legless lava tunnel the bark and sapwood where it over winters, causing ringbarking. Twigs and small branches wilt and die.

This species is also attacked by the Twig Girdler (Oncideres cingulate), a reddish beetle that is 20mm long and produces small lava that girdles twigs by tunnelling, where it overwinters. This weakens the twigs causing them to snap off or results in ringbarking.

Cheiranthus species may be attacked by the Red Turnip Beetle (Entomoscelis americana) which is bright red with black markings in its head and wing covers and feeds on the foliage.

Eucalyptus species and other plants in the Myrtaceae family are attacked by the Flower Scarab Beetle (Protaetia species) a rounded brownish adult that grows to 20mm long, feeding solitary on flower pollen or new growth causing wilting and twig dieback. The insect is found from tropical to temperate regions and is regarded as a minor pest. Eucalyptus are also attacked by Leaf-eating Beetles which eat irregular pieces from the margins.

Damaged Margins on Eucalyptus by the Leaf-eating Beetles

Protea species are also attacked by the Flower Scarab Beetle.

Ficus species          Damaged epidermal layer

Ficus species are susceptible to the Fig Leaf Beetle (Poneridia semipullata). Both adult and larvae feed on the leaves eating the epidermal layer and making the plant in large infestations look poorly.

Ulmus species are attacked by the European Bark Beetle and the Leaf Beetle (Galerucella luteola) adult, which eats areas out of new leaves.

Ficus species are susceptible to the Fig Leaf Beetle (Poneridia semipullata). Both adult and larvae feed on the leaves eating the epidermal layer and making the plant in large infestations look poorly.

Samanea saman fruit pods are attacked when the burchid beetle (Merobruchis columbinus) oviposits in the immature fruit. The lava can kill or damage up to 75% of the seeds but is not commonly a major problem.

Solanum tuberosum is attacked by wireworm (Agriotes species). The larvae of this beetle, tunnels into the tubers.  It is best controlled by planting in the soil which has not been affected previously.

Ulmus species are attacked by the European Bark Beetle and the Leaf Beetle (Galerucella luteola) adult, which eats areas out of new leaves and its lava skeletonise the underside of mature leaves later in the season.

Damage Caused

Some beetles and their larvae may eat the leaf surface in bands leaving the veins intact while other larger beetles tend to eat leaves from the margins preferring new shoots.  

Beetle damage

Cultural Control

Small infestations may be removal by hand where possible.

The Brown Eucalypt Beetle will not fly during the night and if disturbed by shaking or beating the tree, fall to the ground where they can be collected on a tarp that is laid under the tree then destroyed. This method also works on the Flower Scarab Beetle that fall to the ground pretending to be dead when disturbed.

Biological Control

Beetles are eaten by predators including birds, frogs, and lizards and are attacked by parasitic wasps.

Chemical control

Will vary with the pest, the plant on which it is found. The part of the plant being attacked.

Note

It is your responsibility by law to read & follow the directions on the label of any pesticide

Amendments by B. Sonsie Dip Hort Sc Burnley

PEST

   NAME

     Christmas Beetle

     Anoplognathus Species

   ORDER

     Coleoptera

   FAMILY

     Scarabaeidae

Description of the Pest

Christmas beetles are large up to 200mm (¾in) long. The adults have a stout body shape the antennae are flattened into discs. The common species Anoplognathus pallidicollis and Anoplognathus porosus have shiny buffed tan-brown elytra (wing covers) and a metallic green coloured head. Another species (Anoplognathus smaragdinus) are very showy with metallic blue, orange or green colourings. The plump larvae (commonly known as the 'curl grub') are creamy-white in colour with a dark area near the end of the abdomen.

A shiny brown adult that is found in the warmer regions of Australia and is up to 20mm long. This beetle feed on the leaves and when swarming may strip the host tree.

Life Cycle

This insect has a Holometabolous life cycle, i.e. it has a larval and a pupal stage.

The larvae pupate in the soil and the beetles emerge in summer with usually one generation per year.

The larvae can live for up to two years. Adults may live for up to a year, this varies for the species concerned.

Distribution of the Pest

Adult beetles appear in spring with the warmer weather and are found inland or on the coast from temperate to subtropical regions where large numbers attack the foliage of suitable trees. The larvae are not commonly noticed as they burrow and chew the roots of grasses or small plants. This family of insects is found world wide, including Australia.

Period of Activity

The beetles are active from spring to mid summer preferring the warmer weather and the larva feed from late summer to autumn.

Damage Caused

The beetles chew large sections out of the new leaves (a saw tooth pattern to the margin of the leaf) and shoots causing defoliation of the trees when heavily infested and repetitive attack may cause the decline of the host.

The larva eats the roots grasses and in confined situations nursery stock and container plants.

The larvas cause death of grasses as their roots have been severed from their stem. Young plants in confined situations such as pots can also suffer severe damage and may die.

The larvae have little affect on large trees and shrubs

Susceptible Plants

The adult beetles primarily attack many Eucalyptus and Corymbia species but may also be found on Melaleuca and Leptospermum species.

The lava feed mainly on the roots of grasses. The roots of vegetables can also be attacked.

Control

Cultural Control

Small infestations may be removal by hand where possible. Adult beetles can also be controlled manually by knocking them off a small plant and placing the adults into a bucket containing soapy water. Resistant cultivars or hybrids are being researched.

Maintain the vigour of the trees by addressing stress problems.

Biological Control

These insects are part of the Australian ecosystem, and have many predators if the ecosystem is healthy and diverse.

Chemical Control

There is no effective method for spraying adult beetles as they are nomadic.

The larvae may be chemically control in confined areas such as a containerised plant

Note

It is your responsibility by law to read & follow the directions on the label of any pesticide.

Monitoring

Adult beetle are attracted to lights

Amendments by B. Sonsie Dip Hort Sc Burnley

PEST

   NAME

     Frog Hopper (General)

     Various Frog Hopper Species

   ORDER

     Hemiptera

Description of the Pest

Generally frog hoppers grow up to 15mm in length, and look simular to small cicadas, but capable of hopping. The adults construct conical tubes that are attached to branches from the narrow end. The larvae live inside the tube emersed in secreted fluids that protecting it from predators and attracts ants. Both nymphs and adults have piercing and sucking mouth parts.

The Common Froghopper (Chaetophyes compacta) is 8mm long. Females are brownish and the males are black. It feeds solitary or conjugate in colonies.   Adults can fly but will hop away immediately if disturbed.

Appearance and Distribution of the Pest

The adults and nymphs are present throughout the year in tropical to warm temperate regions and are dispersed by flying.

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Females deposit eggs in tubes that are attached to the host, and several generations may appear annually on the same plant.

                  Frog Hopper with missing wing cover.

Damage Caused

Nymphs and adults are gregarious, and both stages may be found on host plants at the same time. If large numbers attack young new growth, sucking sap from leaf petioles and young stems, the host plant may become stressed. Severe infestations may weaken and eventually kill the plant.

The nymphs exude a sweet secretion, which is attractive to ants that attend and protect the colony. The honeydew also causes sooty mould to occur as a secondary problem.

Susceptible Plants

Most Eucalyptus species, Acacia species, Casuarina species and many other native or ornamental plants.

Cultural Control

Improving the culture of the host species may assist in maintaining vigorous growth, to minimise shock from infestations. It may be possible to remove them by hand from young trees, using a small butterfly net.

Biological Control

Controlled by natural predation.

Chemical Control

Under normal circumstances, it is impractical and unnecessary to treat mature trees however, Frog hoppers on young plants may be treated with a contact insecticide. Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Gumtree Hopper, Jassid

     Eurymela Species

   ORDER

     Hemiptera

   FAMILY

     Eurymelidae

Description of the Pest

Generally the gumtree hopper grows up to 12mm in length, resembling a small tiny cicada, and its "A"-shaped folded wings give it a characteristic triangular cross-section. The nymphs are orange, with blue markings, while the adult hopper is black or dark blue, with small white spots on its wings. Adults can fly but will hop away immediately if disturbed. Both nymphs and mature hoppers have piercing and sucking mouth parts and there are many species.

  Common Jassid

Image by B. Sonsie

Common Jassid (Eurymela fenastrata) adult is black with yellow or white markings on its wings, and is a specialised hopper that only feeds on Eucalyptus species.

Appearance and Distribution of the Pest

The adults and nymphs may be present throughout the year across most of Eastern Australia, and in warm climates.

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Females deposit eggs in slits they make in the bark of the host, and several generations may appear annually on the same plant.

Period of Activity

Hoppers may be active throughout the year in tropical to temperate climates.

Damage Caused

Nymphs and adults are gregarious, and both stages may be found on host plants at the same time. If large numbers attack young new growth, sucking sap from leaf petioles and young stems, the host plant may become stressed. Severe infestations may weaken and eventually kill the plant. The nymphs exude a sweet secretion, which is attractive to ants; it also causes sooty mould. Some species produce toxic saliva that kills the effected plant tissue; other species carry plant viruses.

Susceptible Plants

Most Eucalyptus species and ferny-leafed Acacia species.

Cultural Control

Improving the culture of the host species may assist in maintaining vigorous growth, to minimise shock from infestations. It may be possible to remove them by hand, from young trees, using a small butterfly net.

Biological Control

Controlled by natural predation such as small birds, spiders, assassin bugs, ladybirds and lacewings.

Chemical Control

Under normal circumstances, it is impractical and unnecessary to treat mature Eucalypts; however, hoppers on young plants may be treated with a contact insecticide.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Cottonycushion Scale

     Icerya purchasi

   ORDER

     Hemiptera

   FAMILY

     Margarodidae

Description of the Pest

This pest is also known as Ribbed Scale or Bark-louse. The small soft bodied female is oval shaped, reddish-brown, and produces an extended fluted egg sack up to 10mm long that is covered with white, waxy threads. The crawlers are red with dark legs and the adult males are winged. The nymphs infest the ribs and veins of leaves, sucking the sap. Adults and nymphs suck sap with piercing and sucking mouth-parts and ants are attracted to the honeydew produced by feeding nymphs.

       Image by B. Sonsie

Appearance and Distribution of the Pest

This insect has a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Adults appear during the warmer months and infest twigs branches and are found on the trunks of some trees.  Ants will usually be present as feeding nymphs produce honeydew, as will the Verdalia ladybeetle, (Rodolia cardinalis), which feeds on the nymphs.

This Australian native insect has been introduced to many countries such as the USA, India, Egypt and South Africa and was only brought under control by the introduction of the Verdalia ladybeetle.

Period of Activity

There are usually two hatches each year, in early spring and late summer.

Susceptible Plants

There are many plants that are attacked by this insect including Australian native species such as Acacia, Eucalyptus, Pittosporum, Hakea and Grevilleas.

Ornamental trees and shrubs are also attacked including fruit trees and citrus, Liquidambar, Salix, Nerium, Magnolia, and Rosa species.

Palm such as Archontophoenix and Howea species are also attacked particularly when grown as an indoor or glasshouse specimen.

Damage Caused

Heavy infestations may cause die-back, particularly where natural predators are absent (eg in glass-houses). The excretion of honeydew promotes sooty mold that restricts the leaves capability to photosynthesize.

Cultural Control

Dead or damaged parts of the plant should be removed and destroyed including fallen fruit. Small infestations may be removed by hand or squashed on the stems. Healthy plants are less susceptible to attack, so maintain vigour of the plant and avoid using high-nitrogen fertiliser that produces excessive soft young growth.

When pruning susceptible plants paint the cuts with antifungal sealant paint as scale insects are attracted to the sweet smell of the sap. This will reduce the infection rate of the plant.

Biological Control

Natural predators such as parasitic wasps may reduce numbers of active nymphs; parasitic wasps are bred commercially in some areas for this purpose and the main natural predator is the Verdalia ladybeetle, (Rodolia cardinalis). It should be noted, however, that wasps would avoid dusty conditions.

Other predators that assist in control are assassin bugs, lacewings, hover flies and scale eating caterpillars. A variety of birds also attack scales.

Chemical Control

Normally not necessary.

PEST

   NAME

     Cup Moth

     Doratifera species

   ORDER

     Lepidoptera

   FAMILY

     Limacodidae

Description of the Pest

The plump larvae are rectangular, 25mm in length, and primarily green in colour, with brightly-coloured stripes and patterns down the back. They have a pair of protuberances (turret-like) at each end of the body that contain a double row of retractable, stinging hairs, which cause a painful skin irritation if touched. The adult is a pale brown, furry moth with a 30mm wingspan.

Appearance and Distribution of the Pest

A native Australian species and is found from temperate to tropical regions. There are simular pests but different species in the USA.

Life Cycle

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

The larvae pupate in a hard, egg-shaped "cup", which is attached to the twigs of the host. The cup has a lid, which the moth removes to emerge.

Early Larval Stage     

Period of Activity

Most active during Spring and Summer. Outbreaks are sporadic, with large numbers appearing in some years.

Damage Caused

Initially the gregarious young larvae skeletonise the leaves, but as they mature the caterpillars are solitary and feed on the entire leaf; heavy infestations may defoliate large trees.

Susceptible Plants

Eucalyptus, Callistemons and Melaleucas species are the main hosts of this insect. Lophostemon confertus is also commonly attacked.

Cultural Control

Remove by hand (wear hand protection).

Biological Control

Parasitic wasps make no significant difference to numbers.

Chemical Control

Spray small trees with a contact or systemic insecticides during heavy infestations.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Tip Borer

     Various Tip Borer Species

   ORDER

     Various

Description of the Pest

There is many species of moths which are brown, blackish or white up to 30mm long. Generally the fleshy, greenish to cream coloured larvae grow to 25mm long and are sparsely hairy. The Callistemon Tip Borer is laid by a metallic to blackish moth and the larvae are creamy grubs that have true legs. Some larvae are very active when disturbed such as the fleshy Macadamia Twig Girdler which has darker strips on its body and a dark head.

Dieback Borer Damage

Dieback Borer (Platyomopsis armatula) adult is a grey-brown beetle up to 20mm long with small lumps on its wing covers and long antennae. The 15mm long cream coloured larva tunnel under the bark and feed on the sapwood causing ringbarking. The entrance to the tunnel is covered in frass and plants in the Myrtaceae family such as Eucalyptus species are susceptible.  

Elm Twig Girdler (Oberea tripunctata). The adult beetle feeds on twigs causing girdling then deposits eggs during spring. The lava tunnels down the centre of the stem from the girdled point and overwinters in the tunnels. Twigs up to 14mm diameter may snap off at the damaged point and Ulmus species are normally the host.

Mahogany Shoot Borer (Hypsipyla grandella). The adult is a greyish-brown moth with a wingspan up to 45mm with the wings and veins distinctly overlayed in black. It deposits oval eggs that are tiny 0.50mm wide normally deposited in the leaf axil and change colour from white to red in the first 12 hours. In 3 to5 days the larvae emerges and can grow to 25mm long and is brownish white when young and maturing to bluish with a brown head capsule. Swietenia species are damaged as the larvae bore into the new shoots normally during spring or during the rainy season. The shoots and branches wilt then collapse. This is a major economic pest for cultivated trees.

Red Cedar Tip Moth (Hypsipyla robusta) adult is a grey moth with a wing span up to 20mm across and produces fleshy lava with true legs up to 20 mm long that tunnels into the tips of twigs. The tunnels are surrounded by webbing that is littered with pelleted droppings and is normally found on Toona species.

Staghorn Borer larvae grow to 15mm long and are greyish with true legs and the grey adult moth has a wingspan up to 20mm across. It attacks Platycerium species by eating tunnels into the sterile fronds.

Appearance and Distribution of the Pest

They are found mainly on the coast but also inland and are distributed by flying with the assistance of wind.

Life Cycle

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Eggs are laid in bark on the growing tips. Larvae shelter in tunnels they create in the wood, up to 20mm deep.

Period of Activity

Active throughout the year in warm climates and are commonly found from tropical to sub-tropical and temperate regions.

Damage Caused

Generally the symptoms of tip borers is yellowing and curling of the leaves which wilt then die or shoots become blackened and are noticeable in the tree. Extensive feeding by a number of larvae causes dieback but normally, this is a minor pest.

The larvae emerge from their tunnels at night, to feed on the bark around the entrance holes. Entrance holes are covered by a layer of chewed wood fragments ("frass") and silk webbing. Most damage appears on twigs and new growth.

Typical larvae

The Callistemon Tip Borer tunnels down the centre of the twigs causing then to die or break off and the Macadamia Twig Girdler (Neodrepta luteotactella) form tunnels in sapwood that are covered in fine webbing that is dotted in brown excreted pellets. This is the same appearance as the Banksia Web-covering Borer (Xylorycta strigata) larva makes, as it tunnels down the centre of shoots.

Susceptible Plants

Many native and ornamental plants are susceptible to tip borers such as Callistemon, Melaleuca, Banksia, Hakea, Macadamia and Stenocarpus species

Eucalyptus, Callistemon, Corymbia, Leptospermum and Melaleuca species are attacked by the Dieback Borer (Platyomopsis armatula). Twigs and small branches are attacked and the larvae causes ring bark. Affected branches break easily in high winds.

Sambucus, Yucca and Delphinium species are attacked the Common Stalk Borer (Papaipema nebris) which attacks the stems causing the plant to wilt and topple over.

Cultural Control

Larvae may be destroyed after exposure by pulling away the covering pad of frass, or by pushing a length of wire into the tunnel. Damaged branches may be removed, or tunnels plugged.  Infested perennials or annuals should be removed and destroyed.

Biological Control

No effective biological control.

Chemical Control

Spray with Carbaryl (including the trunks or stems) if necessary while the insects are active.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Emperor Gum Moth

     Opodiphthera eucalypti

   ORDER

     Lepidoptera

   FAMILY

     Saturniidae

Description of the Pest

The adult moth is up to 150mm across the wingspan and is pinkish brown and has large eye-spots towards the edge of the wings.

The mature larva is up to 100mm long and is bright green with a yellow stripe on either side of its body. Each segment of the body has 6 fleshy, yellow or purple-blue and or red tubercule (protuberances) with several spiky yellowish hairs.

The larva has chewing mouth parts and the adult moth dose not feed.

The pupa is inside a fibrous spherical cocoon that is brown with a hard texture and is up to 25mm long and attached firmly to the host plant on the twigs or small branches.

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

         Large antennae

Appearance and Distribution of the Pest

The larvae are seen hanging in the host plant and pupate during early summer. It is distributed in sub tropical to temperate climates along the east coast of Australia from Queensland to Tasmania and can be an interesting subject in the garden.

Period of Activity

The larvae are active from late winter to early summer.

Damage Caused

The larvae chew leaves leaving large sections missing or reduce the leaf to only the mid rib. Normally not affecting the plant, and only causing problems when large numbers of larvae infest the host.

Susceptible Plants

There are a wide range of host plants which include, Eucalyptus species, Lophostemon confertus, Schinus areira, Betula pendula, Liquidambar styraciflua and Pinus radiata

Cultural Control

The larvae can be removed by hand and transferred to another host plant or squashed under foot.

Biological Control

Birds commonly eat the larvae, which reduces the numbers significantly.

Chemical Control

Chemicals may be used but normally unwarranted as the damage is not significant.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Eucalyptus lerp

     Cardiaspina species

   ORDER

     Hemiptera

Description of the Pest

The fleshy adult is up to 0.3mm long and covered in a patterned waxy material. The larvae have piercing and sucking mouthparts.

Period of Activity and Distribution of the Pest

Plants are attacked during the warmer months and the favourable conditions are unclear, but some years the pest is in plague proportions. It is commonly found in tropical to warm temperate climates. The fallen leaves are sticky and attaching to people and animals transferring the pest to other sites. It is found from tropical to temperate climates.

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Damage Caused

The leaves are damaged on both sides develop yellow patches and fall prematurely as the nymphs and adults feed.  If a tree has a heavy infestation it may completely defoliated and can lead to the death of the plant.

Susceptible Plants

All Eucalyptus species and is a major problem for many species particularly E. grandis, E. botryoides, E. robusta, E. camaldulensis and E. tereticornis.

Cultural Control

There is no effective cultural control, affected trees should be fertilised and watered to maintain vigour.

Biological Control

The syrphid fly (hover fly) is predatory and may reduce the infestation.

Chemical Control

It is difficult to control and contact chemicals have limited effect. Under heavy infestations tree injection may be warranted. A sleeve must be used to control the oozing latex.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Sawfly (General)

     Various Sawfly Species

   ORDER

     Hymenoptera

Description of the Pest

Adult sawflies are wasps that have derived the name Sawfly from the sawing action to open leaves using there ovipositor. The adults are usually colourful insects. The fleshy larvae normally are tapering caterpillars, some with pointed spine on the tale and are many different colours from black-blue to brown and orange.

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

They are commonly called "spitfires" because, when disturbed, they bend back their bodies and exude a strong, eucalyptus-scented liquid from their mouths. This exudate contains concentrated eucalyptus oil, which can cause severe eye irritation. The non-feeding adults are seldom seen. Sawflies have a complete metamorphosis, pupating in cocoons in the soil for months or years.

Eucalyptus Sawfly (Perga kirbyi) lava is pale brown up to 40mm long. It is a plump grub with a black head and a yellow tipped tail and can be found in groups during the day, but spreads out at night to feed. When disturbed they react by arching there head and wiggling there tail.

European Spruce Sawfly (Diprion hercyniae) feeds on the old growth causing stunting of the host and the larvae overwinter in cocoons on the ground.

Ironbark Sawfly (Lophyrotoma interrupta) is a fleshy tapering grub up to 40mm long. It is pale brown with a black head and a yellow tip on its tail.

Long-tailed Sawfly (Pterygophorus insignis) larvae are greenish with a textured surface and a long pointed tail.

Pin Oak Sawfly (Caliroa lineata) adult is shiny-black up to 6mm long with four wings and the greenish larvae is up to 14mm long. It feeds by skeletonizing the underside of leaves turning them golden-brown as they die and an infestation in a large Quercus species is easily recognisable.

Pine Sawfly (Zenarge turneri) lays larvae that are rough and fleshy up to 10mm long with the abdomen curled.

Steelblue Sawfly

The adult Steelblue Sawfly (Perga dorsalis) female is steel blue in colour, with yellow antennae and legs, growing up to 20mm long, with 40mm wingspans. The insect is called a "sawfly" because of the sawing action of the ovipositor. The yellowish-brown larvae have chewing mouth parts.

Appearance of the Pest

During the day, sawflies congregate in clusters, separating at night to travel and feed on the foliage of the host plant.

Period of Activity

Caterpillars appear in spring through summer and are found from tropical to sub-tropical and temperate regions.

Susceptible Plants

There are many ornamental and Australian native plants that are attacked including Eucalyptus camaldulensis, E. blakelyi, E. melliodora, and E. pauciflora and Callistemon, Leptospermum species.

Eucalyptus species are attacked by the Eucalyptus Sawfly (Perga kirbyi) which can defoliate a tree.

Larix species are attacked by the Larch Sawfly (Pristiphora erichsonii). The adult wasp-like fly deposits eggs in an incision on the twigs during late spring and the 25mm long olive green spiny larvae chew the needles. The larvae overwinter on the ground in brown cocoons.

Melaleucas are also attracts the Paperback Sawfly.

Pinus and Callitris species are attacked by up to four species including the Pine Sawfly (Diprion simile).

Sorbus aucuparia is attacked by the Mountain Ash Sawfly (Pristiphora jeniculeta). The larvae feed on the leaves, leaving only the mid rib and main veins.  Heavy infestations causes serious defoliating of the tree.

Viola species are attacked by the Sawfly (Ametastegia pallipes)  which eats the leaves skeletonising them.

Damage Caused

Generally the larva eat the surface of leaves, skeletonising them when young, but as they develop they eat large pieces leaving only the mid rib. They tend to feed on the terminal shoots, and heavy infestations can defoliating young trees.

Cultural Control

Clustering larvae may be hosed or knocked from branches, falling to the ground where they can be squashed under foot or attacked by other predators. At night when the larvae congregate they can be collected and disposed off. In small infestations they can be picked by hand and destroyed.

Biological Control

The exudate causes most birds to avoid the larva, although cockatoos remove the head and oil gland prior to consumption. They are also eaten by lizards and frogs or attacked by parasitic wasps.

Chemical Control

Affected plants can be sprayed using Maldison or Carbaryl, this is only possible for small trees.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Leafblister Sawflies

     Phylacteophaga species.

   ORDER

     Hymenoptera

   FAMILY

     Pergidae

Description of the Pest

There two commonly seen Leafblister Sawflies are (Phylacteophaga eucalypti) and (Phylacteophagafroggatti) which have simular feeding habits and life cycle.

Generally the larvae of the leaf blister sawflies are segmented and up to 6mm long; feeding on the inside of the leaf where they are only visible if the blistered leaf cuticle is removed.  Adults are sawflies, 5mm long that live for about one week.

                  Blister on Acacia longifolia

Appearance and Distribution of the Pest

Appears both coastally and inland, in temperate areas of Eastern Australia.

Life Cycle

The complete lifecycle takes 6 weeks in the warmer months; longer during winter. The sawfly has a complete metamorphosis, with 4-8 generations each year. Females lay eggs in slits that they have made in the leaf veins. The leaf swells around the eggs, forming galls. Larvae feed between the leaf surfaces, causing blistering. The larvae pupate within the blister.

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Period of Activity

Damage occurs during the warmer months. Young plantations, or trees stressed by drought, are particularly susceptible during these times.

Damage Caused

Mining between the upper and lower leaf surfaces causes blisters, giving a brownish burnt appearance. Heavy infestations may defoliate the plant and repetitive attacks can lead to dieback. The sawfly does not lay eggs above heights of 4m, thus mature trees are unlikely to be seriously damaged. The appearance of the host plant becomes unsightly after an infestation with disfigured leaves.

Susceptible Plants

There are many species that are attacked including Acacia and Eucalyptus species, juvenile foliage is commonly attacked particularly (E. grandis, E. Saligna, E. botryoides & E. robusta, Eucalyptus tereticornis).

Callistemon species, Lophostemon confertus and Buckinghamia celsissima are also susceptible to attack.

Cultural Control

Remove and destroy infested leaves or seriously damaged plants. Mature plants are unlikely to suffer serious damage, unless under stress.

Biological Control

No effective biological controls are known, although natural predators such as parasitic wasps and small birds eat many larvae.

Chemical Control

Systemic pesticides may be sprayed if the blisters are small and the larvae are active - otherwise, chemicals have a limited role.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Bugs (General)

     Various Bug Species

   ORDER

     Hemiptera

Description of the Pest

Generally bugs are sap sucking insects with a strong proboscis and are commonly shield shape. They may be dull grey-brown or brightly coloured with long anatine and legs. They feed in colonies or solitary and cause excessive damage due to the toxic saliva they inject into the plant. They also are capable of emitting a nauseous smell or squirting a caustic fluid when disturbed or they fly away. Both adults and nymphs have piecing and sucking mouthparts and adults commonly shelter under plant litter or under bark during winter.

                  Cotton Harlequin Bug (Male)

Cotton Harlequin Bug (Tectocoris diophthalmus) adult female is up to 20mm long and is orange-yellow with black patches on its wing covers. The smaller male is reddish with bright metallic blue or green markings. Eggs are laid in a spiral arrangement around twigs and both eggs and nymphs are guarded by the adult female.

Adults and nymphs have piercing and sucking mouthparts and cause little damage to the host plant, though may be found in large numbers. They appear during late winter and are more prevalent along coastal regions on plants from the Malvaceae family such as Lagunaria patersonii. Control is not normally warranted.

Crusader Bug (Mictis profana) is a light brown elongated bug to 20mm. It has distinctive pale yellow cross mark, depressed on its back and large rear legs. It has long antennae that are tipped in yellow and when disturbed can secrete a foul smelling caustic fluid. The immature stages (nymphs) are brownish with no cross and marked with two small orange spots on the abdomen.

Both adult and nymph have piecing and sucking mouth parts and are solitary feeders on tender new shoots causing wilting and dieback. They are found on a wide range of plants including Hibiscus and Acacia species and normally do not require control.

Eucalyptus Tip Bug (Amorbus alternatus) adult is a blackish shield-shaped insect up to 20mm long with a spine on each shoulder. The wing covers are marked with a yellowish 'V' pattern and the lava are brightly coloured in shades of blue and orange with its body tapering towards the head.

Harlequin Bug

Harlequin Bug (Dindymus versicolor) is very colourful with red or black upper parts and a green to yellowish abdomen and is up to 12mm long. The wingless nymphs are also brightly coloured and are commonly found in temperate climates on plants and structures such as fences. .

There is also another Harlequin Bug (Murgantia bistrionica) that is found in North America and has simular colourings, habits and grows to 10mm long. The adult lays eggs in double rows on the underside of leaves.

Metallic Shield Bug (Scutiphora rubromaculata) is up to 10mm long. The adult is brightly coloured in metallic blue with two obvious red blotches on its thorax. It is found in tropical to sub tropical regions.

Plant Bug (Hallicotoma valida) is small and blue-black, which slightly engraves the epidermal layer of the leaf turning it yellow and is found on Yucca species.

Rutherglen Bug (Nysius vinitor) is dull grey with silvery wings that up to 5mm long and the winged nymphs are also grey.

Bronze Orange Bug      Bronze Orange Bug Nymph

Appearance and Distribution of the Pest

Generally nymphs appear in winter after hatching from eggs that were laid in late summer under the leaves, generally unnoticed apart from a strong smell.

They are found throughout the world in tropical, sub tropical to temperate regions. They appear from late winter to late autumn and can be seen on the new growth and fruit.

Rutherglen Bug can form large colonies causing the new growth to wilt or stem tissue forms a dry area. It can become a serious pest requiring control.

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

There are five nymphal stages with the eggs laid during late winter and up to 4 generations each season. Certain species of adults tend the eggs until they hatch. The insect over winters as an adult.

                    Harlequin Bug

Period of Activity

This pest is active throughout spring and summer, with large numbers occurring in autumn.

Damage Caused

Generally the nymphs and adults feed on new shoots, the underside of leaves, flowers and stems of plants and mature bugs feed on fruit or seeds. This causes bean pods to become shrivelled and distorted, or tomatoes form mottled areas and peaches exude clear gum. Leaves and flowers wilt or shrivel and die. The North American Harlequin Bug forms white or yellow blotches on the leaf surface causing plants to wilt and die.

Susceptible Plants

There is a wide range of plants that are attacked by various bugs including legumes such as beans or lucerne or pumpkin, spinach, passionfruit and many ornamental and native trees and shrubs. Fruit trees and weeds are also attacked.

Abutilon, Alyogyne, Hibiscus species, Vitis vinifera (grape) and Lycopersicon esculentum (tomato) are susceptible to attack by Harlequin Bug (Dindymus versicolor)  causing damage to new growth and blemishing fruit with there excrement. Many vegetables and fruit trees are also susceptible to attack.

Abutilon, Alyogyne, Hibiscus species are also attacked by the Cotton Harlequin Bug (Tectocoris diophthalmus).

Eucalyptus species are attacked by the Eucalyptus Tip Bug (Amorbus alternatus). The slow moving adults suck sap from the host solitary or in groups causing wilting and sometimes dieback of the branches. It is not regarded as a major pest and control is not normally required.

Ficus and Melaleuca species are attacked by the Metallic Shield Bug (Scutiphora rubromaculata).

Acacia, Cassia, Citrus, Hibiscus, Senna species and Vitis vinifera are susceptible to attack by the Crusader Bug (Mictis profana) damaging new shoots.

Leucanthemum species are attacked by the Four-lined Leaf Bug (Poecilocapsus lineatus). The adult is yellow with four black stripes on its wings and attacks the leaves causing spotting that turns them brown, eventually dieing.

Pennisetum clandestinum (Kikuyu) is attacked by the Billbug (Spenophorus brunnipennis). This weevil produces larva that can be seen at the soil level and are legless up to 10mm long with a brown head and a cream coloured curved body. During early summer affected leaves turn yellow and a second generation may occur in late summer.

Bluegrass Billbug (Sphenophorus parvulus) attacks Poa pratensis (Kentucky Bluegrass).

Cultural Control

Small infestations may be carefully removed by hand or hosed off then collected.  Heavily infested plants or plant parts may be removed and destroyed.  Weed control around the plants may increase possible infestation as the bugs migrate to a new host. A barrier of annuals may be planted around susceptible plants as to attract the bugs once the annual weeds die off.

Remove all rubbish such as woodpiles or garden wast or rubbish from the garden as bugs tend to shelter in these areas. Susceptible plants may be sprayed up to three times during the cooler months with a soapy or glue spray on both sides of the leaves in order to kill the nymphs.

Hosing may also dislodge adult bugs and once on the ground they can be squashed. Another novel method for removal is to use an electric or portable vacuum cleaner to suck the bugs from the host plant. This method is excellent on several species including stink bugs and Christmas beetles.

Biological Control

Bugs are attacked by many predators including; birds, spiders, assassin bugs, parasitic wasp and parasitic fungi. These predators combined still have little control over infestation of susceptible plants.

Assassin Bug Nymph

Chemical Control

Spraying with insecticides is effective, such as Fenthion, Maldison or Dimethoate. Always read the label for registration details and direction of use.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Gall Flies (General)

     Various Gall Flie Species

   ORDER

     Diptera

   FAMILY

     Cecidomyiidae

Description of the Pest

There is about 100 species of flies that are known as gall gnats or gall midges. They infect particularly the leaves usually forming pimple like galls. The buds and stems are also attacked and the galls can be large.

   Blossom Gall Fly on Acacia species

Blossom Gall Fly (Cecidomyia acaciaelongifoliae) attacks spent flowers heads forming large twisted galls that are made up of tubes containing maggots that feed on the flower heads and causing the seed to become malformed, into galls. Not normally requiring control, but plants appear ugly.

    Pimple Gall on Eucalyptus species.

Pimple Gall (Harmomyia omalathi) forms small reddish pimple-like galls that may appear along the mid rib.

Callitris Gall (Diplosis frenalae) is a large gall that that splits in to six sections and looks very simular to a Callitris cone.

Cone Gall (Rhabdophaga strobiliodes) is produced by a small fly that deposits eggs in opening buds. Lave overwinter in the cone shaped galls that inhibit the development of the bud. It is found on Salix species.  

Fergusonina Galls

Image by B. Sonsie

Fergusonina Galls (Fergusonina species) are the result of a symbiotic relationship between leaf nematodes and gall flies such as (Fergusonina nicholsoni). In all cases the nematodes are deposited along with the fly's lava and together they feed on the leaves forming galls, which can become large sometimes cover the entire leaf. The nematodes increase in numbers and when the fly emerges it is infested with them, which are then deposited in the new nest completing the cycle.

Appearance and Distribution of the Pest

The adult infect plants from spring to autumn and are distributed by flying with the assistance of wind. The larvae may also be distributed in infected cuttings or leaves that are transported to another site.

Life Cycle

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

The larvae of these insects are known as maggots. They have chewing mouthparts and the adults have piercing and or sucking mouthparts and one pair of wings.

Period of Activity

Generally the flies are more active during the warmer months of the year and are found in sub tropical to temperate regions particularly on the coast.

Damage Caused

When flowers are attacked the maggot interferes with seed formation and stimulates the growth of galls. Many species of Gall Fly feed off the plant from within the gall and certain species such as Fergusonina Galls (Fergusonina species) forms a symbiotic relationship with nematodes and both feed from within the gall. The leaves are the normal area attacked, but stems are also infected such as the new stems in Callitris species.

Susceptible Plants

There are many species attacked including Acacia, Eucalyptus, Callitris, and Pittosporum species.

Catalpa species are attacked by the Midge (Cecidomyia catalpae) which lays eggs in the leaves and the emerging lava eat circular sections of the leaf surface causing distortion.

Eucalyptus species are attacked by various Fergusonina Galls which may alter the flowering or seed production of the host.

Viola species are attacked by the Gall Fly (Phytophaga violicola) which attacks the leaves forming galls and distorting its shape. After time the leaves form wet-rot and the plants development is dwarfed.

Cultural Control

Pick off the damaged leaves where possible prior to the emerging adult and destroy. This will reduce build up of the population, but if there is evidence of emergent holes in the gall it is too late. Plants that are repetitively attacked should be removed and the area re-planted with a less susceptible species. Infected trees respond to fertilising and watering to improve vigour against the attack.

Biological Control

Parasitic wasps lay there eggs in the galls and some species of nematode eats the larvae prior to emergence.

Chemical Control

Chemicals may be injected or sprayed but normally has limited effect as the insect is inclosed within the gall and is difficult to monitor.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Fruit Tree Borer

     Maroga melanostigma

   ORDER

     Lepidoptera

   FAMILY

     Oecophoridae

Description of the Pest

Adults are white, satiny moths with 40-60mm wingspans; their black abdomens are fringed with orange-brown hair and tufted at the tip. Larvae are reddish brown with a few hairs, up to 50mm in length.

Appearance and Distribution of the Pest

An Australian native pest that is found on the coast or inland from temperate to subtropical regions.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Eggs are laid singly, in bark normally in the branch junctions. After the eggs hatch the larvae shelter in the shallow tunnels they create in the wood, up to 60mm deep. The tunnel entrance is closed with webbing and the lava pupates, emerging the following summer.

Period of Activity

The pest is active throughout the warmer months and the lava overwinters in its sealed tunnel.

Damage Caused

Larvae emerge from their tunnels at night, to feed on the callus tissue around the entrance holes. Entrance holes are covered by a layer of chewed wood fragments ("frass") and silk webbing. Most damage appears on the branches, especially at junctions. Extensive feeding may girdle the branch cause ring-barking.

On inspection, the wound is covered in webbing material and on removal the true extent of the damage is revealed, bear wood. These areas may be infected by wood rot fungi.

Susceptible Plants

There are many plants that are attacked by the Fruit Tree Borer including; Acacia, Banksia, Callicoma, Lagerstroemia, Eucalyptus and Jacaranda species, and flowering stonefruit.

Factors that contribute to attack are infertile poorly drained soils or damage to the bark, mechanically or from sunscald.

Cultural Control

Larvae may be destroyed after exposure by pulling away the covering pad of frass, or by pushing a length of wire into the tunnel. Damaged branches may be removed. Use correct tree surgery techniques to seal the wound.

Improve the vigour of the tree by lightly cultivating the surrounding soil then fertilise and water. It may also be lightly pruned to encourage new growth.

Biological Control

No effective biological control, but several parasites and predators keep the numbers down.

Chemical Control

Spray with Contact insecticides (including the trunks).

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Cicadas

     Various Cicada Species

   ORDER

     Hemiptera

   FAMILY

     Cicadidae

Description of the Pest

Cicadas are sap-sucking insects, up to 60mm in length. They penetrate soft shoots with their long proboscis. The nymph is subterranean and also has piercing and sucking mouthparts; it feeds on the roots of the plant. The nymph emerges to shed its skin and become a winged adult; the discarded nymph shell (exoskeleton) is often seen on tree trunks and wooden fences during summer. Adults are best known for their constant high-pitched chirping as the temperatures increase during summer months.

Adult Black prince   Adult Cicada

Adults of different species may be black, green, brown, orange or yellow.

Common species include the green grocer (Cyclochila australasiae); black prince (Pasltoda argentata); double drummer (Thopha saccata); and floury baker (Abricta curvicosta).

Life Cycle

This insect has a Hemimetabolous life cycle, i.e. nymphs and adults.

The nymphs remain underground for several years; they emerge and become adults during late spring to early summer. Eggs are deposited into slits made by the female in the bark of host plants - this process may cause die-back.

Distribution of the Pest

World wide including Australia

Adult emerges from the exoskeleton of the nymph  

Adult Cicada

Period of Activity

Adults remain active throughout the warmer months of the year.

The larvae are feeding in the soil for many years all year round.

Damage Caused

This is a large, noisy insect whose presence seldom causes serious damage to plants.

Soft shoots on which the adults feed may wilt. Adults produce an exudate similar to honeydew.  Loud noise is due to the males only (up to 120 decibels) can also be a problem.

Dieback to stem can result due to the activities of the females laying their eggs in the young stems

Susceptible Plants

Cicadas feed on a wide range of native plants - including Eucalypts and exotics.

Control

Natural predators including birds, possums and spiders may reduce numbers.

Cicadas are a minor pest and control measures are not usually necessary. They are an important component of the Australian ecosystem.

Note

It is your responsibility by law to read & follow the directions on the label of any pesticide

Amendments by B. Sonsie Dip Hort Sc Burnley

PEST

   NAME

     Eucalyptus Leaf Beetles

     Various Leaf Beetle Species

   ORDER

     Coleoptera

   FAMILY

     Chrysomelidae

Description of the Pest

There are many beetles that attack the foliage of plants with one group specialising in Eucalyptus species. These adult beetles have a rounded spherical shape up to 15mm long with small antennae and large feet. The colour varies from yellow-brown, grey, black or green.

The larvae are pale cream-yellow and normally with black areas on the body. Both larva and adult have chewing mouthparts.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

The eggs are laid on stems or on the petiole of leaves. They are arranged in a circular pattern in compact rosettes and are a creamy white colour. The larvae pupate in the soil.

Period of Activity and Distribution of the Pest

This pest normally occurs during the warmer months and is found throughout Australia. It is not known what climatic conditions are favourable.

Damage Caused

The adults and larvae eat the leaves. The adults eat mature and new leaves along the margins leaving them scalloped. The larvae tend to attack the juvenal leaves at the top and outer parts of the tree eating them in an irregular manner, often leaving only the midrib. They normally appear in groups.        

Susceptible Plants

These beetles attack many species of Eucalyptus and some species of Acacia.

Cultural Control

The pest may be removed by hand if the infestation is small and plants that are under attack may be helped with improved culture, ie Fertilising, watering and mulching.

Biological Control

The larvae are attacked by birds and large ants, which diminish the numbers significantly.

Large Ant    Birds

Chemical Control

If the infestation is severe a contact pesticide may be used but normally it is unwarranted.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Gumleaf Skeletoniser

     Uraba lugens

   ORDER

     Lepidoptera

   FAMILY

     Noctuidae

Description of the Pest

The adult moth can have a wingspan of up to 250mm and are silvery grey with darking makings on the forewing tips. It can lay its eggs in groups, of up to 200. The larva is yellowish brown and can grow up to 25mm when fully fed. It has a prominent horn like projection on its head, which is actually a stack of outgrown, cast off head capsules. The larva is covered in white hairs that can cause localised skin irritations.

Appearance and Distribution of the Pest

The adult lays its eggs during Spring and the larvae are active throughout the warmer months. This pest is widely distributed throughout the temperate and subtropical regions and its favoured conditioned have not yet been documented.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

The adult lays eggs of the surface of the leaves where the larvae feed. After which it may, drop to the ground on silken threads, or remain on the bark of the host tree to pupate.  

Period of Activity

The feeding larvae are active during the warmer months of the year.

Damage Caused

The gregarious larvae skeletonise the leaf by eating the leaf blade, leaving the veins; mature larvae can chew large sections of the leaf away. The skeletonised leaves turn brown and give the host plant a burnt appearance during heavy infestations of the pest.

Susceptible Plants

Many species of Eucalypts are attacked, particularly Snow Gum (E. paucifolia), Red River Gum (E. camaldulensis), Blackbutt (E. pilularis) and Sydney Blue Gum (E. saligna).

Cultural Control

Physical removal of foliage on young plants. where the eggs are clearly visible.

Biological Control

There is no effective biological method of controlling this pest.

Chemical Control

Tree may be sprayed with a contact pesticides in conjunction with a wetting agent (to penetrate the hairs on the caterpillar's body) are often successful.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Jewel Beetles

     Various Jewel Beetle Species

   ORDER

     Coleoptera

   FAMILY

     Buprestidae

Description of the Pest

There are many species of Jewel beetles and generally have flat and elongated bodies with metallic, iridescent-patterned shells in orange red or yellow. The plump larvae are cream-coloured legless grubs, shaped like a cobra head with a large body segment behind the head.

Appearance and Distribution of the Pest

They are common throughout Australia particularly in the drier regions.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Eggs are laid in cracks in the bark of the host, upon which the mature larvae pupates.

Period of Activity

Most active from spring through summer.

Damage Caused

The larvae feed beneath the bark, producing oval (in cross-sectioned) tunnels with much sawdust ("frass") around the entrance. The larvae burrow into the cambium layer. Stressed or damaged plants are more susceptible to infestation and may display branch die-back; occasionally the larvae may ring-bark the trunk.

Susceptible Plants

Many plants are attacked especially in the Myrtaceae family such as the Eucalyptus, Leptospermum and Melaleuca species.  Allocasuarina are also attacked.

Banksia species may be attacked by the Banksia Borer (Cyria imperialis).

Cupressus species are attacked by the Cypress Jewel Beetle (Diadoxus erythrurus).

Cultural Control

Remove damaged branches or repair using arboriculture techniques. Improve the culture of the plant.

Biological Control

No effective biological controls.

Chemical Control

No practical chemical control of the larvae is available. Tree injection is unsuccessful because the larvae tunnel into the woody part of the plant.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Nectar Scarabs

     Phyllotocus species

   ORDER

     Coleoptera

   FAMILY

     Scarabaeidae

Description of the Pest

Adult beetles have a characteristic scarab shape, up to 6mm in length, with exaggerated hind legs. The head and thorax is dark brown; the wings have orange-brown longitudinal striations. Larvae appear as small white curl grubs. Both larvae and adults have chewing mouth parts.

Flower Scarab Beetles (Protaetia apecies). Thiese active beetles are stout and broad up to 20mm long. The colouring is normally brown with some having small pale markings on the wing covers. It is commonly found feeding on Myrtaceae or Proteaceae flowers (pollen) or shoots of Acacia species. It is a solitary feeder and may cause dieback of the host.

Appearance and Distribution of the Pest

Nectar scarabs are Australian natives but are rarely found in the Northern Territory. They are distributed by flying to a new host plant.

Life Cycle

These insects have a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

It has a complete metamorphosis producing one generation every one to three years, depending on the species. The eggs are laid during spring normally near the surface of the soil and the lava burrow into the soil. The lava overwinters deep in the soil and pupates during spring.

Period of Activity

Most active during the warmer months, when plants are flowering.

Damage Caused

Larvae feed on decaying vegetable matter and cause little damage. Adults swarm on host plants in large numbers, feeding on pollen and nectar; when swarming they may also feed on the flower parts.

Susceptible Plants

Many plants are attacked by this insect including Acacia, Eucalyptus, Melaleuca and Callistemon species. Ornamentals such as Rosa and Dahlias species are also attacked.

Cultural Control

Small infestations may be removed by hand but certain species such as the Flower Scarab Beetle drop to the ground and pretend to be dead. This is an opportunity to collect them on a piece of plastic if it is spread around the plant.

Biological Control

No known controls.

Chemical Control

Contact insecticides such as Carbaryl are effective, but not normally necessary.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Soldier Beetles

     Chauliognathus lugubris

   ORDER

     Coleoptera

   FAMILY

     Cantharidae

Description of the Pest

Adults are narrow, with dull green wing covers, black heads with a yellowish orange band at the base of the thorax; the tip of the abdomen is also yellowish orange. Adults and larvae have chewing mouth parts.

Appearance and Distribution of the Pest

Occurs throughout Australia and are found on many flowering plants awaiting the arrival of other insects or lava to feed off.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

Period of Activity

During flowering in warmer months.

Damage Caused

Larvae and adults feed on caterpillars and scale. Adults also feed on nectar and, in large numbers may cause physical damage to host flowers and disturb fruit setting.

Susceptible Plants

This insect may be found on all flowering plants but is rarely a pest. Eucalyptus species is commonly a host.

Cultural Control

Remove by hand (not normally required).

Biological Control

None known.

Chemical Control

Not normally required but if spraying is required it should be carried out in the late afternoon and predominantly directed on the swarm. Spraying may also kill beneficial insects such as bees.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Gumtree Scale

     Eriococcus coriaceus

   ORDER

     Hemiptera

Description of the Pest

The tiny female is pale brown soft scale; it only becomes plainly visible when its egg-sack develops, growing up to 3mm long and becoming darker. Males are a small, flat, white scale and apparent in large clusters. Scales have sucking and mouth parts.

Appearance and Distribution of the Pest

An Australian native pest that occurs during the warmer months of the year. Similar to the Abo.

Life Cycle

This scale is hemimetabolous. Females lay eggs in egg-sacks, from which nymphs emerge.

Period of Activity

The pest is most active from spring through summer.

Damage Caused

Nymphs and adults cause damage by sucking the sap. Stressed and immature plants are particularly susceptible to damage: dieback of affected branch may occur during heavy infestations, and infestations on the main stem may kill young plants. Scales produce honeydew, which causes sooty mould.

Susceptible Plants

Many Eucalyptus species; some species are more susceptible than others.

Cultural Control

Remove and destroy the branches. Small infestations may be rubbed off by hand (wear gloves).

Biological Control

Ladybirds are natural predators, but have limited influence on control of numbers.

Chemical Control

Spray the infested branches with white oil; emergent nymphs may be sprayed with contact insecticide.

PEST

   NAME

     White Stemmed Gum Moth

     Chelepteryx collesi

   ORDER

     Lepidoptera

Description of the Pest

Adults are dull brown moths with obvious zig zag pattens on the wings. Larvae are plump and fleshy caterpillars up to 100mm long, dull red with yellow bands and have tufts hairs on each segment. Pupating larvae form a silken bag that tapers at each end and are armed with protruding irritating hairs.

Appearance and Distribution of the Pest

Common throughout eastern Australia from tropical to temperate regions and predominantly on the coast. They are solitary feeders.

Life Cycle

This insect has a Holometabolous life cycle, ie. When metamorphosis is observed during the pupal stage.

The caterpillars pupate in silken cocoons that may be found some distance from the feeding area, such as under the eves of buildings.

Period of Activity

They are most active during the night; during the day they move to the lower parts of the tree and hide in bark crevices. They are most active during Spring and Autumn.

Damage Caused

Large pieces of leaves are eaten or the leaf is stripped back to the midrib.  The caterpillars can defoliate a small tree; they migrate en masse to the next host tree.

Susceptible Plants

Angophora and Eucalyptus species

Cultural Control

The caterpillars may be removed by hand, but take care and wear gloves as it has irritating hairs.

Biological Control

Parasites and predators contribute to the control of numbers.

Chemical Control

Spraying has little effect as this is a nomadic caterpillar.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Mistletoe

     Various Mistletoe Species

Description of the Pest

This is not an insect pest but a group of parasitic plants, some specific to the host and others that attack a wide range of hosts. The mistletoe is seen as a pendant cluster of bright green leaves on the branches of the host plant. It has bright flowers that produce nectar, attracting birds which spread the seeds.

Cluster of bright green leaves         

Appearance and Distribution of the Pest

It can appear throughout the year in warmer climates, otherwise seeds germinate from spring to summer. The seeds are distributed by birds that land on the host plant and deposit seeds.

Flower Head          Leaves

Period of Activity

Infestation occurs primarily during summer but growths may be seen throughout the year.

Damage Caused

Seeds germinate on the host and form a connection, not killing the cells but working with them in order to feed on the sap with ever enlarging roots. Small infestations do little harm to the host but vigorous species may infest trees eventually killing them. This is a serious problem in cleared land where small stands of trees have been left and generally have no follow up saplings.

Enlarging Roots

Susceptible Plants

Normally attacks trees that are in an open sunny exposed position such as a roadside setting or an isolated specimen. Stressed trees are particularly venerable and are easily killed.

Calocedrus decurrens is attacked by the leafy mistletoe (Phoradendron juniperinum).

Cultural Control

Cut off and destroy clumps and feed the plant to improve vigour. Removal of the plant is an important maintenance procedure in small groups of trees to reduce losses.

Biological Control

There is no current biological control.

Chemical Control

The tree may be injected with a systemic poison, but great care should be taken as the correct chemical and dosage rate is critical. Contact the local Dept. of Agriculture for advice.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Grasshoppers and Locusts

     Various Grasshopper Species

   ORDER

     Orthoptera

Description of the Pest

Grasshoppers and locusts are simular but varying in colour. Grasshoppers are a solitary insect while Locusts tend to feed in swarms that vary in size from season to season, depending on climatic conditions. Generally there are two types of insect, one with antennae that are longer than its body (long-horned grasshopper) and are regarded as a solitary feeder. The other insects have short antenna and are known as (short-horned grasshopper) and include species that swarm, examples are below.

The adults may be winged, short-winged with the forewing thicker forming a cover when at rest, or wingless. Some male species can produce sound from special forewings, abdomen and hind legs. They all have enlarged hind legs designed for jumping and are usually well camouflaged.

Nymphs are simular to the adults but smaller and wingless, both have chewing mouthparts.

Australian Plague Locust (Chortoicetes terminifera) is a brown adult short-horned grasshopper with females up to 40mm long and has black markings on the transparent hindwings. The smaller male is simular and both are heavy feeders eating large pieces out of leaves. They are found from tropical to temperate zones forming plagues that migrate and consume all that is in its path.

Giant Locust (Valanga irregularis) is a large brownish short-horned grasshopper up to 80mm long with transparent hind wings and the bright green nymphs do not resemble the adults. Both adults and nymphs feed on leaves, eating large pieces and attacking Palms or Hibiscus species. Common in tropical and sub tropical regions.

Green Gum Tree Hopper (Torbia perfecta) adult is a long-horned grasshopper up to 50mm long with antennae that grow to 60mm in length and has folded flat wings that resemble a leaf. It is a solitary feeder that is found from sub tropical to temperate regions attacking primarily Eucalyptus species.

Katydid (Caedicia olivacea) adult is dark green long-horned grasshopper up to 50mm long and grows antennae to 60mm long. Its wings fold to appear as a leaf and are not easily seen.  Commonly a solitary feeder that is found on the coast or inland from sub tropical to temperate regions, and may occur in large numbers feeding primarily on Eucalyptus species.

Migratory Locust (Locusta migratoria) is a brown short-horned grasshopper up to 60mm long and is recognisable by the spiny hind legs and strong looking head, but feeds solitary primarily on Palm species, eating large portions of the fronds. It is found in tropical regions but migrates south with the aid of prevailing wind to sub tropical regions, mainly along the coast.

Appearance and Distribution of the Pest

These insects are found in Africa, Australia, North America, Asia, and Southern Europe. They infest areas by hopping at the nymphal stage or flying with the assistance of wind. They tend to prefer inland regions, but are also found on the coast.

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Generally the adult deposits up to 30 eggs (egg pod) in the soil during spring, summer and autumn with up to two or more generations per year. The emerging nymphs are called hoppers and there is five stages before the wing buds emerge developing into an adult. The eggs overwinter in a dormant state underground emerging during spring.

Period of Activity

The adults appear during the warmer months of the year. In the dryer areas outbreaks are less frequent though in areas of high rainfall, the outbreaks occur frequently and may turn to plagues.

Damage Caused

Grasshoppers and Locusts are very destructive, singularly and especially in swarms which can defoliate entire fields of corn. The host plant has large pieces of its leaves eaten, the bark is nibbled and almost any part of the plant attacked.

Susceptible Plants

A wide range of commercial crops including corn, wheat, and vegetables. Ornamental shrubs, trees or weeds are also attacked. Certain species are a major pest problem for agriculture.

Cultural Control

It is difficult to control but in early mornings the insects are slow and may be caught and squashed. In a large garden or farms, allow the chooks to free range around the vegetables. They are persistent consumers of the insect. Plants may be covered with a net to reduce access for the insect.

Biological Control

The adult insect is eaten by many birds, predator bugs, lizards and frogs. This helps control small outbreaks but has little effect on swarms.

Chemical Control

It is difficult to chemically control Grasshoppers and Locusts and must be carried out over a wide area and spraying may not guarantee that the crop is not damaged. Bates or traps may also assist in controlling numbers.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Termites (General)

     Various Species

   ORDER

     Isoptera

   FAMILY

     Various

Description of the Pest

There are many species of termite found throughout the world particularly in the tropical regions. There are three species that are a pest of living trees. The Subterranean termite (Coptotermes species), Dampwood termites (Porotermes species) and the Drywood termites (Cryptotermes species) all have a highly developed social structure that includes a king, queen, workers and soldiers.

Adult males and females are winged up to 14mm long and the workers are small, 5mm long, wingless with creamy white bodies, commonly known as' White Ants'. Although they are referred to as white ants there body is not constricted between the thorax and abdomen as in true ants and are totally unrelated.

The workers have well developed mandibles for chewing. They are also blind and consist of about 80% of the colonies numbers. Soldiers are also blind, sterile and have very large jaws to protect the colony from invaders.  There numbers consist of 3% of the colony and commonly have a pointed dark head.

The Subterranean Termite (Coptotermes lacteus) and (Coptotermes brunneus) which is only found in Western Australia are the most destructive. They form colonies normally under ground or in trees with subterranean tunnels that radiate out up to 50m from the nest, feeding only on dead wood such as posts, fallen branches or roots. This mound forming insect requires constant moisture that is collects from the soil and the tunnels average 200mm below the soil surface.

Appearance and Distribution of the Pest

Termites are found throughout the world from tropical to temperate regions. The adult insects are winged, flying to other areas to form new colonies during late spring. Termites are commonly undetected as they feed on the inside of tree trunks or form shelter tubes on vertical faces.

  Shelter Tubes

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

Termites have several nymphal stages and adults. Both nymphs and adults have chewing mouth parts.

Male and female fly to a new site in late spring, where there membranous wings fall away from the body. They then mate and produce a small number of eggs, about thirty. After the eggs hatch the female develops into the egg laying queen and both nymphs and soldiers tend her requirements.

In time the nest develops and can become large very large, such as an earthen mound up to 7m tall. The termites avoid light and remain within the galleries they have constructed, protected from environmental extremes such as temperature or humidity.

  Soldiers

Period of Activity

They are most active during the warmer months of the year.

Damage Caused

The termites form galleries that honeycombing the interior of the host. In the case of trees, branches become structurally weak and break off after the termites enter through the roots or bark. They then eat there way through the heartwood up into the branches. Certain species of termite can also ringbark young trees, and large trees that are infected with termites eventually die. Other species attack fence posts or buildings causing extensive damage.

Susceptible Plants

A wide range of living or dead trees, shrubs and vines are attacked. Non living structures such as fences, buildings or dead trees are also eaten. Many Eucalyptus species when under stress are infected.

Dendranthema species roots are attacked by termites causing the plant to wilt.

Psidium species (Guava) are attacked by the Subterranean Termite (Reticulitermes flaviceps).

Cultural Control

It is very difficult to control termites and preventative measures are essential. Such as the removal of dead or dieing trees including the roots. All possible food sources should be burnt or removed off site. Nests may also be destroyed when found. have soft fleshy bodies that are easily damaged.

Biological Control

Termites are most vulnerable when in flight where they are attacked by birds, lizards ants or adverse climatic conditions. Animals such as echidnas or bandicoots destroy forage lines or entire nests, seeking there soft fleshy bodies.

Chemical Control

It is important to identify the particular species of termite before applying chemicals as this may vary. A trained pest controller should be contacted in order to carry out the best possible method of control.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

PEST

   NAME

     Winter Bronzing

     Thaumastocoris species

   ORDER

     Hemiptera

Description of the Pest

Thaumastocorids bugs are sap sucking insects with a strong proboscis and are shield shape. The adult is dull brown with long anatine and legs, growing to 5mm long. The ovoid black eggs are microscopic size 1mm in length and in time the egg colour remains black unlike Psyllids eggs that fade. They are laid in groups from 60 to 1,000 on the leaves in clusters up to a 10mm wide. They feed in colonies and cause excessive damage. Both adults and nymphs have piecing and sucking mouthparts and adults commonly shelter under leaves or bark during winter.

          Eggs mag. 274 x

Image by A. Noack

Appearance and Distribution of the Pest

Generally nymphs appear in early winter to winter after hatching from eggs that were laid in late autumn, but the pest may be seen through the year in extreme cases. The adults can fly short distances or further with the assistance of wind, to a new host plant to distribute eggs or feed. This is not a wide spread problem, but an important one in urban areas of Sydney Australia. Other species are found in Tasmania and Western Australia. Colonies of this insect have been recorded in South Africa and are thought to be originating from Australia.

Active insect on leaf

Life Cycle

These insects have a Hemimetabolous life cycle, ie. When the immature nymphs resemble the adults.

The black eggs hatch within two weeks and there are five nymphal stages before reaching an adult.  The origin of the pest is unknown and it has only recently become a pest.

Damage Caused

The sap sucking activities greatly reduces the capability of the leaf to photosynthesise by feeding on the epidermal layer of the leaves. These leaves are then shed, and the repetitive attack on a tree weakens its ability to produce food (starch). Branches and twigs die back and eventually the tree starves to death. Initial symptoms are pale green foliage that turns reddish or bronze. This colour change occurs quickly over a 5 day period and infestations normally occur on a small part of the crown at first. The insects do not produce honeydew

White Stemmed Gum Moth and Winter Bronzing.

Image by A. Noack

Susceptible Plants

Eucalyptus species are the host with certain species most susceptible, such as Eucalyptus nicholii (Narrow Leafed Black Peppermint).

Other species are less severely attacked these include, Eucalyptus bicostata (Southern Blue Gum),  Eucalyptus tereticornis (Forest Red Gum), Eucalyptus viminalis (Ribbon Gum), Eucalyptus camaldulensis (River Red Gum), Eucalyptus microcorys (Tallow Wood), Eucalyptus sideroxylon (Mugga Iron Bark) and Corymbia citriodora (Lemon Scented Gum).

Cultural Control

It is very difficult to control this pest using cultural methods, but infested trees can be watered and feed to improve vigour.

Biological Control

There is no satisfactory biological control but the Mymarid wasp deposits her eggs in up to 30 Thaumastocorids eggs at a ratio of 1 to 1.

Mymarid wasp next to pin head

Chemical Control

There is no long term solution to infestations, but trees may be injected in extreme cases.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.

DISEASE

   NAME

     Eucalyptus Shoot Blight

     Quambalaria pitereka

Description

A fungal problem that attacks some Eucalyptus and Corymbia species.

Symptoms

Young shoots and leaves are attacked causing them to become distorted and have an appearance of being spatted with white paint. This is caused by sporulation of the fungus and it progresses from the leaves to the stems causing splitting of the bark. Infected leaves fall prematurely and dieback occurs in the stems. The overall effect is a sparsely foliaged tree with heavily distorted shoot tips.

Source and Dispersal

It is found on other infected trees and is dispersed by wind, rain or infected nursery stock and contaminated leaves or branches. Once a tree is infected it moves rapidly throughout the plant.

Favoured Conditions

It prefers humid still conditions with warm temperatures and is particularly a problem in tropical areas. It has been recorded in many areas of New South Wales and Queensland, especially in coastal and highland areas.

Affected Plants

Eucalyptus, Corymbia and Angophora species such as C. citriodora, C. maculata and Angophora costata are infected and repetitive attack stunts or can in rare cases kill the tree.

Non-chemical Control

On small trees remove and destroy the infected parts or in a nursery remove and destroy infected stock.

Chemical Control

Plants may be sprayed at five day intervals with copper oxychloride if possible.

Note

Always read the label for registration details and direction of use prior to application of any chemicals.