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* Powdery mildew
(Uncinula necator) conditions for infection occur wen there
is at least 0.1" of rainfall at 13 hours of leaf wetness and
> 50 degrees F; spore germination inhibited >95 degrees F.
Requires 5-7 days cycle from infection to conidial production under
optimum condition. Rainfall not required for release of secondary
spores.
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