Remove and destroy infected leaves (be sure to wash your hands afterwards).The best control measure for tomato blight is prevention (see below).Depending upon the status of the crop, preventative treatment of cucumber and melon crops (clade 2 downy mildew) may have some justification. To date, there have been no reports of cucurbit downy mildew here in WI. The Cucurbit Downy Mildew forecasting webpage ( ) is not forecasting the movement of the pathogen, but is offering reporting of findings of cucurbit downy mildew from the US (map below shows new reports this past week in MD, KY, and SC). Fungicide details can be found in the 2023 Commercial Vegetable Production in Wisconsin Guide, Extension Document A3422. Once thresholds are met for risk of early blight and/or late blight, fungicides are recommended for optimum disease control. In using this tool, be sure to enter your model selections and parameters, then hit the blue submit button at the bottom of the parameter boxes. In addition to the potato field weather stations, we have the UW Vegetable Disease and Insect Forecasting Network tool to explore P-Days and DSVs across the state ( ). Potato Physiological Days (P-Days) through Data are available in graphical and raw formats for multiple locations at. Data from: will be used to supplement as needed for missing data points and for additional locations (indicated with *). Weather data used in these calculations is from weather stations that are placed in potato fields in each of the four locations, as available. ![]() Red text in table indicates threshold has been met or surpassed. A Disease Severity Value or DSV of ≥18 indicates the threshold for late blight risk and triggers preventative fungicide application. A Potato Physiological Day or P-Day value of ≥300 indicates the threshold for early blight risk and triggers preventative fungicide application. Many thanks to Ben Bradford, UW-Entomology Stephen Jordan, UW-Plant Pathology and our grower collaborators for supporting this effort.
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