PLANT PROTECTION 1 â Pests, Diseases and Weeds

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Ruth rescan PLANT PROTECTION 1 – Pests, Diseases and Weeds BEETLES AND WEEVILS Summary - Some exceptions SOME DISTINCTIVE FEATURES BEETLES ADULT Flight Usually can fly Head Body LARVA Legs Antennae Not long Not roughened Various (not usually elbowed) Mostly thoracic legs which may be short or long PLANT DAMAGE .DIRECT FEEDING DAMAGE. LEAVES FLOWERS BUDS FRUIT SEED STEMS BARK Eaten, eg Christmas beetles Leafmining, eg lantana leafminer Skeletonization, eg leafeating ladybirds Chewing damage, eg orchid beetle Chewing damage, eg driedfruit beetles Bark, eg elm bark beetle Borers, eg longicorn beetle .INDIRECT DAMAGE. Transmit diseases, eg elm bark beetle spreads Dutch elm disease overseas WEEVILS ADULT Flight Many unable to fly Head Body Antennae Long snout Usually rounded, often roughened with knobs, spines, scales Often elbowed, clubbed at tips .DIRECT FEEDING DAMAGE. LEAVES SEEDS STEMS BARK ROOTS TUBERS Chewed edges, eg black vine weevils Chewing, eg rice weevil Bark, eg pine bark weevil Borers, eg elephant weevil larvae Surface chewers, eg garden weevil Gouging tubers, eg black vine weevil LARVA Legs Body Legless Stout grub, usually feeds within plant tissues (stems, trunks, roots, seeds etc) .INDIRECT DAMAGE. Fig. 68. Elephant weevil (Orthorhinus cylindrirostris.). Left: Exit holes made by emergence of adults after pupating under bark. Right: Adult elephant weevils, note elbowed antennae. PhotosNSW Dept of Industry and Investment. 102 Insects and allied pests - Coleoptera (beetles, weevils)
PLANT PROTECTION 1 – Pests, Diseases and Weeds Fig 69. Beetle ‘borers’ can grow up to 30 mm in length, bark has been removed. Upper: Larvae of jewel beetles (Buprestidae) are cobra-shaped. Lower: Larva of a longicorn beetle (Cerambycidae). Adults do little, if any damage, some jewel beetles are important pollinators. PhotosNSW Dept of Industry and Investment. Fig. 70. Leaf beetles (Chrysomelidae). Upper: Leaf beetle (adult) 5-15 mm long which feeds on foliage. Lower: Larvae 10-20 mm long which also feed on foliage. PhotosNSW Dept of Industry and Investment. TRADE NAMES NEMATODE SPECIES TARGET BEETLE/WEEVIL Fungi BioCane Metarhizium sp.) Greyback canegrub (Dermolepida albohirtum) SUPPLIERS Becker Underwood www.beckerunderwood.com Nematodes Nematode Heterorhabditis bacteriophaga Black vine weevil (Otiorhynchus sulcatus) EcoGrow www.ecogrow.org.au/ Nematode Heterorhabditis zealandica Argentine stem weevil (Listronotus bonariensis) African black beetle Blackheaded cockchafer Redheaded cockchafer Argentine scarab Bill bug weevil EcoGrow www.ecogrow.org.au/ Nematode Steinernema carpocapsae Banana weevil borer (Cosmopolites sordidus) EcoGrow www.ecogrow.org.au/ Bionem C Millenium Steinernema carpocapsae Ground dwelling insects including billbugs, black vine weevil, strawberry root weevil Becker Underwood www.beckerunderwood.com Fig. 71. Biological control of beetles using fungi and nematodes. Follow storage and application instructions carefully. Insects and allied pests - Coleoptera (beetles, weevils) 103
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Insect secretions PLANT PROTECTION
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Control methods Cultural methods.
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Root structure of dock (Rumex spp.)
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PLANT PROTECTION 1 â Pests, Diseases and Weeds

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PLANT PROTECTION 1 â Pests, Diseases and Weeds