Wetting April 7-8 Winchester and Tyro, VA

Apple buds at our AREC are now at 1/2-inch green-tip stage with some approaching tight cluster. 

With wetting starting at 6 AM yesterday, and starting to dry as of 8 AM this morning, we did not have enough wetting for a scab infection at 38-44° F.

Wetting in the Tyro area, central Virginia, began at 4 AM Apr 7 and continued for more than 26 hours at 42-47° F with 1.25 inch rain. This was more than adequate for a scab infection period. Tyro also was close to an infection period  Apr 3-4 with 11 hr wet with light rain and temperatures 51-59° F.

Expect the release of powdery mildew conidia as buds approach the tight cluster stage.