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2005 Downy Mildew Infection Period May 26 - June 26*
Penn State-FREC, Biglerville, PA**

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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. *Campbell Scientific & Field Monitor Weather Data Systems.



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Last modified May 15, 2008
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