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Cucurbit Downy Mildew

Michigan Cucurbit update | June 21, 2023

June 21, 2023August 21, 2023 cuccap CucCAP Disease Management Team

Clade 2 downy mildew infects cucumbers and melons and spores from this subtype were trapped in Bay, Allegan and Saginaw counties last week.

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Downy Mildew in SC

June 20, 2023June 23, 2023 cuccap Cucurbit Crop & Disease Management Resources

Clemson plant pathologist Tony Keinath attributed the discovery at the Coastal Research and Education Center on June 12 to a rain event that occurred the previous week.

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S.C. Field Update | June 19, 2023

June 19, 2023August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Squash, cucumbers zucchini are all coming to market. Watermelons and Cantaloupe will be following very soon. Downy mildew is active in all cucurbits. Rotating materials is crucial to prevent resistance. Gummy stem blight is also very active in cucurbits.

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Cucurbit Downy Mildew updates May 2023 | ipmPIPE

June 16, 2023July 7, 2023 cuccap Cucurbit Crop & Disease Management Resources

CDM Epidemic Updates for May 5, 2023 to June 13, 2023.

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Clade 2 Cucurbit downy mildew spores in Michigan

June 13, 2023July 3, 2023 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

Growers are urged to scout cucumbers and melons and check the website for updates.

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Grower’s should implement preventative program for CDM

May 27, 2023June 7, 2023 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew symptoms on watermelon tends to be distinct compared to other cucurbits. The symptom start as small yellow spots that becomes dark necrotic.

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Cucurbit Downy Mildew identified in S.C.

May 20, 2023October 14, 2023 cuccap Cucurbit Crop & Disease Management Resources

According to the South Carolina Grower, cucurbit downy mildew was identified in South Carolina on May 12. The identification came from butternut squash grown in a sentinel plot at the Coastal Research and Education Center in Charleston, South Carolina.

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Cucurbit Downy Mildew found in SC

May 17, 2023May 25, 2023 cuccap Cucurbit Crop & Disease Management Resources

Cucurbit downy mildew was identified in South Carolina on 5/12/23. The identification came from butternut squash grown in a sentinel plot at the Coastal REC in Charleston.

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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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