Grape Disease Risks: 5/1 – 5/8/2024

Here’s 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. Since last week, we have been using a different downy mildew model due to inconsistency with the NEWA model. This model uses the past five days of weather to estimate spore production and the next seven-day forecast to estimate the infection risk.

Due to frequent rain events in the past several days and forecasted rains, downy mildew risks are high in several locations. Also, please note that we saw more days with the black rot risk. Please see my presentation slides from the last meeting for more detailed recommendations.

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