Irene stayed little longer than I expected in our area. At the end of Sunday, Winchester area received a total of about 0.5 inches of rain. I was monitoring the RH for last 2-3 days, but it was below 90% (actually it was 60-70% in most of time between rains). It was probably because of high wind due to Irene. Based on this information, the risk of Botrytis is not high; however, as with any precipitation events, it varies dramatically even between short distances. (For example, our AREC station received 1.2 inches or so from Irene.) Thus, please check your local weather service.
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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