Thursday, May 5, 2011

Disease risks from yesterday's rain

Winchester area (and many other central to northern VA areas) received rains from the evening of 5/3 to the morning of 5/4.  For us, it started around 8 PM on 5/3 and ended around 8:40 AM on 5/4 with 0.24 inches of precipitation.  The relative humidity was above 90% until 10 AM or so.  Thus, it was about 14 hours of estimated wetness event with an average temperature of 53F.  It was long enough for black rot risk and moderate Phomopsis risk.

We are expecting a few more nights with low temperature (I hope it won't be a frost event), and more rains during this weekend.

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