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Downy Mildew (Plasmopara viticola): Infection to the first
appearance of symptoms approximately 4 days. Rain is the principal
factor promoting epidemics. Temperature plays a less important role
by retarding, accelerating the development of the disease. Green
parts of vine and leaves are susceptible to infection. Rainfall
not required for release of secondary spores.
Grape
Disease Infection and Data
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