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Powedery Mildew (Oidium)
Downey Mildew (Peronospora)
Eurtypa Dieback "Dead Arm"
Esca (Black Measles)
Bunch Rot (Grey Rot and Botrytis)
also called Oidium
thrives in humid but dry conditions
affects green parts of plant
affects yields if before flowering, affects ripening after
controlled by sulfur and fungucides
attacks green portions of the vine, inhibiting photosynthesis
Bordeaux Mixture prohibits its grwoth
mixture of copper sulfate, lime, and water used to combat downey mildew as well as bacterial blight
also called "Dead Arm"
carried by rain and enters through pruning wounds
reduces yeild but not quality
also known as black measles
caused by complex of fungi
no known control or cure
spread by rain or pruning shears
came to Europe on Phylloxera resistant
very bad yeild reductions
controlled through fungicide sprays
transmitted by glassy winged sharpshooter usually near vineyards
reduces chlorophyll, kills vine
kills young grapevine shoots
spread by rain and pruning tools
can be controlled by Bordeaux Mixture
reponsible for 60% of worlds crop losses
pretty colors, but downward curling of the leaves
reduced yeilds and delayed ripening
incurable but does not kill vine
"nepovirus" spread by nematodes feeding on infected rootstock
severely reduces yeilds and productive lifespan
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