PLANT PROTECTION 1 â Pests, Diseases and Weeds

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PLANT PROTECTION 1 – Pests, Diseases and Weeds WHAT ARE PESTS AND DISEASES? PESTS AND DISEASES A PEST is an organism that at any given time or place, is undesirable. Cabbage white butterfly caterpillar chewing broccoli leaves. The cabbage white butterfly is the worst butterfly pest in the world. PhotoCIT, Canberra (P.W.Unger). A DISEASE is any condition of a plant that interferes with its normal structure, functions or economic value. Fungal leaf spots on strawberry PhotoNSW Dept of Industry and Investment (M.S.Senior). DIFFERENCE BETWEEN A PEST AND A DISEASE . IT CAN BE DIFFICULT TO KNOW. whether one is dealing with a pest or disease, as definitions of these terms are often inconsistent. Pests and diseases have been grouped together and re-divided into 2 new groups: Parasitic pests and diseases – Insects and allied pests – Snails and slugs – Vertebrate pests – Nematode diseases – Virus and virus-like diseases – Bacterial diseases – Fungal diseases – Parasitic flowering plants Non-parasitic pests and diseases – Living agents, eg lichens – Non-living agents, eg environment 2 Pests and diseases
PLANT PROTECTION 1 – Pests, Diseases and Weeds PARASITIC PESTS AND DISEASES Cabbage white butterfly (Pieris rapae), caterpillars feed on cabbages, stock, etc. Snails and slugs damage a wide range of plants Fruit bats (flying foxes) can be pests of fruit. Root knot nematodes (Meloidogyne spp.) cause galls up to 20 mm across to develop on roots. Crown gall (Agrobacterium sp.) causes galls 20-300 mm across to develop at the crown of Rosaceous plants. Rose mosaic (a complex of virus diseases). Black spot of rose (Marsonnina rosae). Mistletoe on a tree. PARASITIC PESTS & DISEASES 3 Insects and allied pests 5 Snails and slugs 227 Vertebrate pests 239 Nematode diseases 251 Virus and virus-like diseases 273 Bacterial diseases 293 Fungal diseases 313 Parasitic flowering plants 387 PARASITIC pests and diseases 3
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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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