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Fungal Diseases

Powedery Mildew (Oidium)
Downey Mildew (Peronospora)
Eurtypa Dieback "Dead Arm"
Esca (Black Measles)
Black Rot
Bunch Rot (Grey Rot and Botrytis)

Bacterial Diseases

Pierce's Disease
Crown Gall (Black Knot)
Bacterial Blight

Viral Diseases

Leafroll Virus
Fanleaf Degeneration

Phytoplasma Diseases

Flavesence Doree

Powdery Mildew

fungal disease
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

Downey Mildew

fungal disease
attacks green portions of the vine, inhibiting photosynthesis
Bordeaux Mixture prohibits its grwoth

Bordeaux Mixture

mixture of copper sulfate, lime, and water used to combat downey mildew as well as bacterial blight

Eutypa Dieback

fungal disease
also called "Dead Arm"
carried by rain and enters through pruning wounds
reduces yeild but not quality

Esca

also known as black measles
fungal disease
caused by complex of fungi
no known control or cure
spread by rain or pruning shears

Black Rot

fungal disease
came to Europe on Phylloxera resistant
very bad yeild reductions
controlled through fungicide sprays

Bunch Rot

grouping of fungal diseases
includes grey rot and botrytis cinerea

Botrytis conditions

warm temperatures and humidity of at least 90%

Pierce's Disease

bacterial disease
transmitted by glassy winged sharpshooter usually near vineyards
reduces chlorophyll, kills vine
quarantine necessary

Crown Gall

also called black know
causes tumors in trunk
spread through bacteria infected budwood

Bacterial Blight

bacterial disease
kills young grapevine shoots
spread by rain and pruning tools
can be controlled by Bordeaux Mixture

Leafroll virus

viral disease
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

Fanleaf degeneration

"nepovirus" spread by nematodes feeding on infected rootstock
severely reduces yeilds and productive lifespan

Flavesence Doree

phytoplasma disease
spread by leafhoppers and cuttings
insecticides used to control leafhoppers

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