Friday, July 25, 2014

Diease risks from yesterday

Winchester area received a shower yesterday, resulted in 5+ hours of wetness in lower 70F.  It was an infection risk event for downy mildew, and very low infection risk event for Botrytis.  In addition, we observed dews in the last two nights, indicating high humidity, which can trigger downy mildew to produce spores.  As usual, late season downy tends to appear on younger leaves on the top of the canopy.  Please keep eyes on them!  There is a chance of rain on Sunday and Monday.

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