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Cucurbit Downy Mildew Update for Ohio (August 27, 2026)
https://cdm.ipmpipe.org/ The current epidemic status map indicates that cucurbit downy mildew (Pseudoperonospora cubensis) remains active in northern Ohio, with confirmed reports concentrated across...
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Vegetable Crops Field Night: See the Latest Research in Action!
Join The Ohio State University Extension for an evening in the field and discover the latest advances in vegetable crop production, pest management, and applied research. Whether you are a commercial...
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Cucurbit Downy Mildew Update (August 11, 2026)
Cucurbit downy mildew has now been confirmed in Ohio. According to the Cucurbit Downy Mildew Forecasting Center (CDM ipmPIPE https://cdm.ipmpipe.org/), a new outbreak was reported in Fulton County,...
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Cucurbit Downy Mildew Update (August 11, 2026)
Cucurbit downy mildew has now been confirmed in Ohio. According to the Cucurbit Downy Mildew Forecasting Center (CDM ipmPIPE https://cdm.ipmpipe.org/), a new outbreak was reported in Fulton County,...
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Cucurbit Downy Mildew Update (July 31, 2026)
As of July 31, 2026, cucurbit downy mildew activity remains limited in the Midwest. The latest Cucurbit Downy Mildew Forecasting Center (CDM ipmPIPE) epidemic status map indicates that confirmed...
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OSU sentinel plots and spore traps update July 28, 2026
Figure 1. Spore trap results for Michigan (Based on MSU spore traps) and Ohio (Based on OSU sentinel plots and spore traps) As of July 28, 2026, cucurbit downy mildew sporangia have been detected only...
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Article 6
Downy mildew monitoring As of July 17, 2026, cucurbit downy mildew sporangia have been detected in six monitored counties in Michigan, including Allegan, Berrien, Muskegon, Bay, Monroe, and Saginaw...
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Cucumber Downy Mildew in Wooster Sentinel Plot and Fremont Research Plots
Dr. Francesca Rotondo, director of the OSU Plant Diagnostic Clinic, confirmed downy mildew on cucumber in the Wooster (Wayne County) Downy mildew on cucumbers in the OSU Sentinel plots at NCARS,...
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Cucumber Downy Mildew Reported Today in Wayne County, OH
Early symptoms of downy mildew on a cucumber leaf. Image by Francesca Rotondo. Downy mildew was found on cucumbers in central Wayne County, OH today. This is a bit early for downy mildew in this state,...
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Cucumber Downy Mildew Reported for the First Time in 2024 in Ohio
Downy mildew on cucumber in Medina County, OH, July 2, 2024. Photo by Frank Becker. Downy mildew was found today in cucumbers in Medina County, OH. Dr. Mary Hausbeck also reports today the first siting...
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News from OSU Vegetable Pathology
I retired December 31, 2023 from OSU after 32.5 years as a professor and State Extension Specialist in Vegetable Disease Management. It Sally Miller and Andres Sanabria was a joy and a pleasure to work...
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Late Appearance of Phytophthora Blight in Peppers and Cucurbits Wreaking Havoc
Bell pepper fruits with Phytophthora blight, received in late August 2023 by the OSU Plant and Pest Diagnostic Clinic. Photo by Francesca Rotondo. Phytophthora blight on pumpkins received in October...
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More First Reports – Downy Mildews of Basil and Cucumber in Ohio
Basil plants with severe downy mildew symptoms in a big box store garden center in Wooster, OH, 2021. Photo by F. Rotondo. We received a report on August 8 from an Ohio Master Gardener of sweet basil...
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Downy Mildew Reported on Pumpkins in Fulton County, OH
Partial map of 2023 cucurbit downy mildew reports as of August 7, 2023. Counties in red indicate new reports (<7 days), while counties in green have older reports. cdm.ipmpipe.org. Bill Holdsworth...
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Powdery Mildew Management in Cucurbits
Powdery mildew colonies on the underside of a pumpkin leaf. Fungicide applications should start when these colonies are first observed during scouting. It is important to check both surfaces of the...
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Cucumber Downy Mildew Spreading
Map of 2023 cucurbit downy mildew reports. Red = reported <1 week ago; Green = reported > 1 week ago. cdm.ipmpipe.org Downy mildew is now confirmed in cucumbers in five Ohio counties: Sandusky,...
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Cucumber Downy Mildew Confirmed in Three Ohio Counties
Map of reported cucurbit downy mildew outbreaks. New for this year in Ohio: Medina, Wayne and Knox counties. cdm.ipmpipe.org. Severe cucumber downy mildew in Medina County, OH, July 24, 2023. Photo by...
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Cucumber Downy Mildew Confirmed in Michigan
Downy mildew of cucumber. Downy mildew was confirmed today in Saginaw County, MI. Dr. Mary Hausbeck’s team at Michigan State University also detected spores of the downy mildew pathogen,...
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Cucumber Downy Mildew Reported in Ontario, Canada
Cucurbit downy mildew map – click on map to enlarge it. https://cdm.ipmpipe.org/ Downy mildew was found on cucumbers in Haldimand-Norfolk, Ontario on July 1 and Chatham-Kent, Ontario on July 4. Even...
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Start Scouting Cucumbers in Northern Ohio for Downy Mildew
Early symptoms of cucumber downy mildew. Photo by Raven Schaffter. With the recent mild, cloudy weather, we could see an early arrival of downy mildew in northern Ohio. Downy mildew is favored by...
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