fungal diseases

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slide 1 pest and diseases of grapes diseases fungal powdery mildew downey mildew rust phomopsis cane and leaf spot disease botrytis bunch rot bacteria crown gall of grape viruses grapevine fan leaf virus arabis mosaic virus rupestris stem pitting virus pests grape cane borer mealy bug spider mites berry eating creatures thief wasps ants birds squirrels vine girdler fungal diseases powdery mildew (uncinula necator) powdery mildew affected bunch & leaves powdery mildew on fruits symptoms powdery mildew produces white, powdery growth on grape leaves and shoots. severely infected leaves may turn brown and fall off. infected berries appear rusty or scaly. they may fail to mature properly or split open. severe powdery mildew infection on grape leaf spore (conidia) production of powdery mildew on a grape leaf ecology the fungus survives the winter in infected grape tissue. wind carries spores long distances. unlike most other fungus diseases, powdery mildew tends …

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des if downy mildew is a problem, a program of fungicide sprays may be needed. captan, copper compounds, (fixed coppers and bordeaux mixture), mancozeb, ridomil/mz, ridomil /copper, sovran, and ziram botrytis bunch rot of grape (botrytis cinerea) discolored, shriveled berries caused by botrytis bunch rot botrytis cinerea sporulating on grape berries symptoms ripening grapes are affected by a rot with sufficient rain and humidity, berries split open and develop a grayish mold on the surface. affected berries may shrivel in the dry climate. ecology infection is optimal at 15-20oc with free water or over 90% humidity. grape cultivars with dense canopies, thin skins, and/or tight clusters are more susceptible to botrytis bunch rot management cultural management prevent excessive vine growth by judicious use of water and fertilizer. prevent berry damage (powdery mildew birds and insects) canopy management fungicides phomopsis cane and leaf spot disease (phomopsis viticola) infected leaves infected inflorescence …

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ering. as they age, the tissue darkens to brown. the surface becomes open and the texture becomes moderately hard and very rough ecology spread through propagation of diseased wood. management cultural management select sites with good air and water drainage avoid vine stress due to poor nutrition or low ph pest control programs for nematodes do not propagate wood taken from galled vines hot water treatment of vines is effective in reducing crown gall infection levels in planting materials fungicides pests of grapes grape cane borer (amphicerus bicaudatus) adult damage grape cane borer egg grape cane borer larva grape cane borer pupa damage small holes can be seen on the vine bore the vine and weaken the vascular functions vine become weak and dry management cultural practices such as removal and destruction of affected canes chemical practices spider mite (tetranychus pacificus) damage mites feeding on the undersides of the leaves …

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slide 1 pest and diseases of grapes diseases fungal powdery mildew downey mildew rust phomopsis cane and leaf spot disease botrytis bunch rot bacteria crown gall of grape viruses grapevine fan leaf virus arabis mosaic virus rupestris stem pitting virus pests grape cane borer mealy bug spider mites berry eating creatures thief wasps ants birds squirrels vine girdler fungal diseases powdery mildew (uncinula necator) powdery mildew affected bunch & leaves powdery mildew on fruits symptoms powdery mildew produces white, powdery growth on grape leaves and shoots. severely infected leaves may turn brown and fall off. infected berries appear rusty or scaly. they may fail to mature properly or split open. severe powdery mildew infection on grape leaf spore (conidia) production …

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