Grape Disease Risks: 5/21-28/2025 + DM forcast

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).

In addition, we generated downy mildew forecasted risk based on the past seven days of weather and a 48-hour forecast. This effort has been supported by the VA Wine Board and Southern Region Small Fruit Consortium. Please click the figure below to make it larger.

Although the NEWA downy mildew model indicated a relatively low risk during the last week, our model suggests a moderate probability of infection risks in the next few days at many locations.

For the detailed recommendations, please check our pest management guides, the previous post about at bloom protection, and the slides from our last meeting.

[Correction: earlier today, I posted the table below based on an 8-day forecast. We realized that the risks are higher than they should be. We will fix it by next week!]

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