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Cucurbit Downy Mildew

Diagnostic Guide for Cucurbit Downy Mildew | APS

May 23, 2020September 28, 2023 cuccap CucCAP Disease Management Team

Diagnostic Guide for Cucurbit Downy Mildew by Andres Salcedo, Mary Hausbeck, Stacey Pigg, and Lina M. Quesada-Ocampo Published Online:14 May 2020 DOI: 10.1094/PHP-12-19-0095-DG    

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Downy Mildew | Cornell Vegetables

May 20, 2020September 22, 2021 cuccap Cucurbit Crop & Disease Management Resources

“Cucurbit downy mildew is a devastating disease in central and eastern United States as well as globally. Cucurbit downy mildew can cause severe losses. It is caused by Pseudoperonospora cubensis, which is an oomycete pathogen, otherwise known as a water mold.”

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Cucurbit Downy Mildew ipmPIPE April 3 to May 13, 2020 epidemic updates

May 4, 2020September 22, 2021 cuccap Cucurbit Crop & Disease Management Resources

From April 3 to May 8 there were reports of CDM in the U.S from FL and GA.

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Cucurbit Downy Mildew Forecasting Resumes for the 2020 growing season

March 20, 2020October 8, 2020 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

A valuable resource available to cucurbit growers on the CucCAP website is the Cucurbit Downy Mildew ipmPIPE Pest Information Platform for Extension and Education.

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Better Cucurbit Varieties Coming Soon | VSCNews

November 20, 2019August 27, 2024 cuccap CucCAP Cucumber Team

CucCAP plant breeder, Todd Wehner talks about breeding cucumber and watermelon varieties for disease resistance.

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Cucumber downy mildew moves across Michigan | MSU Extension Vegetables

August 21, 2019October 8, 2020 cuccap CucCAP Disease Management Team

Downy mildew on cucumber has been verified in three counties on the west side of Michigan and one county on the east side of Michigan. Cantaloupe crops are also at risk.

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Cucumber downy mildew disease confirmed in research plot in southwest Michigan | MSU Extension Vegetables

July 29, 2019September 22, 2021 cuccap CucCAP Disease Management Team

Downy mildew on cucumber has developed in a small research plot at the Southwest Research and Extension Center in Benton Harbor, Michigan. This is the first confirmed report in Michigan in 2019.

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Cucurbit Downy Mildew Update | Cornell Cooperative Extension

July 27, 2019September 22, 2021 cuccap Cucurbit Crop & Disease Management Resources

Up until this week, most of eastern NY was under “low risk” of spores blowing in.  However, the CDM Forecasting System now lists NY at high risk for CDM (especially cucumbers).

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Featured Article

CucCAP scientists identify markers for powdery mildew resistance in watermelon

Powdery mildew outbreaks, caused by Podosphaera xanthii, cause reduced yields and fruit quality in watermelon. CucCAP scientists at Clemson University and the USDA Vegetable Laboratory Charleston SC employed a bulked segregant analysis approach using data from 1147 accessions from the USDA Citrullus germplasm collection to perform an extreme-phenotype genome-wide association study (XP-GWAS) of tolerance to P. xanthii race 2W. Kompetitive Allele-Specific PCR (KASP) markers were designed for significant SNPs associated with reduced disease. The best marker in each region explained 21-31% of the variation in powdery mildew tolerance.

For further reading:

Branham et al., 2025. Extreme-phenotype genome-wide association study (XP-GWAS) of powdery mildew race 2 W tolerance in the USDA Citrullus germplasm collection. Scientific Reports. DOI10.1038/s41598-025-89445-8

 

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USDA National Institute of Food and Agriculture U.S. DEPARTMENT OF AGRICULTURE

The Cucurbit Coordinated Agricultural Project (CucCAP) is a USDA-National Institute of Food and Agriculture Specialty Crop Research Initiative grant under award number
2020-51181-32139.

Cooperating Institutions:

Boyce Thompson Institute; Cornell University; Michigan State University; North Carolina State University; Clemson University; University of Puerto Rico; University of Wisconsin; University of Florida; University of Georgia; West Virginia State University; U.S. Department of Agriculture, Agricultural Research Service

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