We had two wetness event due to lines of rain passed by yesterday (7/17/09). The first one started around 11:30 am, and wetness lasted until 3:30 pm or so (4 hours) with an average temperature of 71F. The second one started around 8:40 pm and wetness lasted until 2:00 am (6 hours) with an average temperature of 66F. These events accounted for downy mildew infection, potential powdery mildew ascospore discharge, and light infection for Botrytis. Both are little shy for black rot infection event.

As I mentioned in the previous post, your vines should be very close to the end of the critical period. After it is done, you can relax a bit in terms of downy, powdery, and black rot infection on berries.

More rain events are in the forecast on Monday to Wednesday.