Wednesday, July 14, 2010

Disease risks from yesterday's rain

Finally, we received a decent amount of precipitation.  Although the central VA received a much needed rain on Monday, Winchester and surrounding area received only about 0.02 inches of rain.  Then on Tuesday, Winchester area received a series of thunderstorms from 5 PM until little after midnight on Wednesday (~ 1 inch).  The relative humidity stayed high (>90%) until 8 AM this morning.  It accounted for an estimated 15 hours of wetness with an average temperature of 77F.  It was long and warm enough for infection process of downy mildew, black rot, Botrytis, and Phomopsis.

We are also expecting around 30% chance of rain on both Friday and Saturday.

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