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2005 Downy Mildew Infection Period May 1 - June 6*
Penn State-FREC, Biglerville, PA**

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Apple Scab infection perios 4/21/04

* 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.
** Campbell Scienctific & Field Weather Data Systems: data up to 7:00 a.m.

Download Excel Spreadsheet of weather data


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Last modified December 20, 2006
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