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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. Data as of 2:00 pm on 5/12/08.
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