Grape disease risks from the NEWA

Here is a snapshot 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  (I reported to the NEWA, but I am not sure when/if they can fix it…)

Downy mildew risk forecast

We generated the downy mildew forecasted risk based on the past seven days and an 8-day weather forecast. Please click the figure below to enlarge. It seems that we are expecting rain next week. The VA Wine Board and Southern Region Small Fruit Consortium have supported this effort.

Downy mildew is still important late in the season because it can infect leaves, and with a severe infection, grapevines will defoliate. Please check this post for the management tips.