Vegetable Crop Update – May 4, 2026
In this issue: Rhizoctonia in vegetable crop systems | Weather-based crop and disease decision-making tools summary
Vegetable Disease Control Laboratory of Amanda J. Gevens
In this issue: Rhizoctonia in vegetable crop systems | Weather-based crop and disease decision-making tools summary
In this issue: Seedcorn Maggot Update & Management | Cabbage Maggot Update & Management | Early Season Potato Disease Concerns | Potato Scouting Class at UW-Hancock ARS on May 18 | Tutorial for How & Why the UW Veg Disease & Insect Forecasting Network Tool Works
In this issue: Potato Cull Pile Management | Potato Volunteer Risk in 2026 | Potato Late Blight Fungicides 2026
In This Issue: Updates on information resources | A3422 Commercial Vegetable Production in Wisconsin 2026 | WPVGA/UWEX Grower Education Conference Online Proceedings | UWEX Central WI Processing Crops Meeting, UW-Hancock ARS on Mar 18, 2026 | Rhizomania – a new beet disease for WI
In mid-December 2025, AMVAC Chemical Corporation, the manufacturers of the fungicide Blocker (pentachloronitrobenzene, PCNB), decided to stop producing Blocker 4F and 10G. In effect, this concludes production of Blocker for the future. The Blocker that is on the shelves at this time is all that will be available for future use. It is estimated that this will leave potato growers with a supply that may satisfy only 25-33% of the potato use demand in 2026.
In This Issue: Late blight updates for potato/tomato | Cucurbit downy mildew updates
In This Issue: End of season crop production comments | Potato tuber heat necrosis and hollow heart | Late blight updates for potato/tomato | Cucurbit downy mildew updates | Pink eye of potato
In This Issue: Disease forecasting updates for potato early blight and late blight | Cucurbit downy mildew updates | Black dot and silver scurf of potato
In This Issue: Vegetable production updates | Disease forecasting updates for potato early blight and late blight | Cucurbit downy mildew updates | Angular leaf spot of cucurbits
In This Issue: Disease forecasting updates for potato early blight and late blight | Cucurbit downy mildew updates | Phytophthora crown and fruit rot in cucurbits and solanaceous crops | Corn earworm and its management | PVY and its management