Here are snapshots from the last week, showing the number of days with the risk of each disease: Ph = Phomopsis, PW = Powdery mildew, BR = Black rot, and DM = Downy mildew. N/A means there is no data or some issues with the NEWA (which has been reported).

I hope you have not experienced a significant loss due to the frost event(s). We dodged this time, but it looks like some folks in Central VA got below 32F…

At this point, you do not need to worry too much about diseases other than Phomopsis. However, tracking risks over the course of the season probably provides you with a good idea of what will come next. It is interesting to see that powdery mildew risk events are poping up here and there already.

For the management of Phomopsis, please see the post here or the slides from last week’s online meeting. If you have not, please join our monthly virtual viticulture meetings, usually held on the second Thursday at 1 p.m. If you have not received a note from us about the meeting before, please use the “subscribe” menu so that I can add your email to our list.