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Conditions for Powdery Mildrew (Uncinula necator) infection
occur when ther eis at least 0.1" of rainfall and >50°
F; spore germination inhibited > 95° F. Rainfall detrimental
to spore survival. Requires 5-7 days cycle from infection to conidial
production.
** Campbell Scienctific & Field Weather Data Systems: data up
to 7:00 a.m.
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