Tuesday, July 2, 2013

Disease risks from yesterday and today

We (Winchester area) received a few showers in the past 24 hours, and the longest wetness event was due to a shower passed  around 5 AM this morning.  It resulted in about 10 hours of wetness with an average temperature of upper 60F. It was an infection risk event for black rot, downy mildew, Botrytis, and Phomopsis.  In addition, we received 2-3 showers that resulted in more than 90 min of wetness ( i.e., these showers were downy mildew infection risk events).

Our Chardonnay is close to bunch closure stage, thus, we applied Botrytis treatments this morning.  Bunch closure is the last opportunity for us to deliver materials inside of the clusters, especially with variety with a tight cluster, such as Chardonnay.

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