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. The model calls for some chances of rain here and there, but overall, it looks like we will have a dry week. The VA Wine Board and Southern Region Small Fruit Consortium have supported this effort.
Worth spraying for adult lantern flies?
It really depends on the situation. If you find enough number (my personal threshold is 40-50 adults per mature vine), then I think it worth spraying. If you find only a few, I would wait a bit more, but I may spray for them when they start to lay eggs so that you don’t need to deal with a lot of nymphs in spring.