Winchester area received rains from 11AM yesterday. Although rain was over by the evening, the relative humidity stayed high (>90%) until this morning. Thus, an estimated leaf wetness period was 21 hours with an average temperature of 64F. It was an infection event for downy mildew, black rot and Phomopsis. Also, the humid warm night promote downy mildew to sporulate.
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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