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Disease risks from yesterday's rain

At Winchester, we received 0.25 inches of rain on 4/19/11.  It started from 9:20AM and lasted until 4:20 PM or so, and the relative humidity was above 90% until 5:00 PM.  Thus, we had about 7 hours 40 min of wetness with the average temperature of 55F.  It was long enough for light infection of Phomopsis (= low risk), but it was neither long nor warm enough for black rot.
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Disease risks from yesterday's rain

Winchester area received precipitations from thunderstorms yesterday.  It started around 3:30PM and lasted until 7:00PM.  The actual amount of precipitation was not high (0.05 in) compared with other northern VA regions where a severe thunderstorm warning was issued, but since the ending part of the thunderstorm hit during the evening, the relative humidity was high (>90%) until 2 AM or so.  Thus, it accounted for 11.5 hours of wetness with the average temperature of 73F.  It was warm and long enough for Phomopsis, black rot, and downy mildew. We are still having chances of rain (40-60%) until Monday.
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