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    • Cucumber Disease Management
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Cucurbit Crop & Disease Management Resources

Plant Disease clinics in the USA, Cucurbit disease forecasters, Field & Variety Trials, Cucurbit Variety Trials, Pest Management, Cucurbit Production manuals & handbooks, Disease diagnosis, Disease outbreaks, Extension news, and Cucurbit Grower news.

Watermelon sun protection | VSCNews

June 8, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

South Georgia is on the brink of starting its watermelon harvest season. If farmers hope to capitalize with multiple harvests, they may need to apply chemical applications to protect against sunburn, which has been one of the few concerns during the production season.

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Managing Whitefly Viruses | VSCNews

June 8, 2021June 8, 2021 cuccap Cucurbit Crop & Disease Management Resources

Vegetable disease specialists from the University of Georgia discuss viruses affecting watermelon, squash and cucumbers including cucurbit leaf crumple virus, cucurbit yellow stunting disorder virus, and squash vein yellowing virus.

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Sanitation Important Management Tool

June 1, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew and powdery mildew on melons can spread from older, diseased plants to surrounding fields where plants are still maturing.

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Downy Mildew Spores Identified in Michigan

June 1, 2021June 1, 2021 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

First cucurbit downy mildew spores identified in air samples in Allegan County
by: Mary Hausbeck, Annika Peterson and Doug Higgins

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Extension assists watermelon industry with disease

May 30, 2021October 12, 2022 cuccap Cucurbit Crop & Disease Management Resources

The week of May 10, one such issue reared its head: Gummy stem blight, a fungal infection that affects the stems and leaves of watermelon plants, was found in several fields.

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Crop Updates for 5-24-2021 | Clemson Extension

May 25, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Clemson Extension agents provide weekly updates for each region of South Carolina.

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Downy Mildew Observed in North Florida Watermelons

May 25, 2021June 2, 2022 cuccap Cucurbit Crop & Disease Management Resources

University of Florida/IFAS Extension agents in the Suwanee Valley area are confident downy mildew disease is in the region’s watermelon crop. Producers need to spray for this disease, also known as “wildfire.”

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Cucurbit Downy Mildew epidemic updates May 19, 2021 | ipmPIPE

May 19, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

Reports of CDM from SC and GA on cucumber and from FL on cantaloupe, watermelon, butternut squash, cucumber, and yellow squash.

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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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