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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.

SC Cucurbit Crop update | May 1, 2023

May 5, 2023May 9, 2023 cuccap Cucurbit Crop & Disease Management Resources

Keep scouting for cucumber beetles and squash bugs as both are currently being found in cucurbit crops. Watermelon planting continues on many farms, with damage being observed to new transplants from squash bugs. Spider mites are also being seen at high levels in some watermelon crops.

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Downy Mildew in N. Florida Watermelons | May 2023

May 5, 2023May 9, 2023 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew disease has been confirmed in North Florida watermelons. South Georgia and South Alabama watermelon producers should be wary since the disease can spread easily by the high winds being experienced this week.

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Florida Watermelon Producers Should Guard Against Powdery Mildew

May 3, 2023May 22, 2023 cuccap Cucurbit Crop & Disease Management Resources

Powdery mildew is different than most of the other major watermelon diseases in that it can become active under relatively dry conditions.

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Gummy Stem Blight resistant to multiple fungicides

April 28, 2023May 22, 2023 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

Gummy stem blight on watermelon is on the FRAC “most wanted” list of pathogens at high risk of becoming resistant to multiple fungicides.

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CucCAP Research Publications

April 26, 2023May 26, 2023 cuccap Cucurbit Crop & Disease Management Resources

CucCAP research scientists publish refereed publications, book chapters, and conference proceedings in journals and other publications between September 2020 and April 2023.

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Integrated Crop and Disease Management | Research Publications

April 25, 2023November 1, 2023 cuccap Cucurbit Crop & Disease Management Resources

CucCAP 2: 32 Refereed Journal Articles,

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CucCAP Bioinformatics Team | Research Publications

April 25, 2023May 26, 2023 cuccap Cucurbit Crop & Disease Management Resources

The CucCAP Bioinformatics published eight publications in research journals from 2020 to2023.

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Melonworms and Pickworms in Watermelon

April 19, 2023 cuccap Cucurbit Crop & Disease Management Resources

Caterpillar pressure has increased to moderate levels in Homestead, Florida, though beet armyworm was reportedly at high levels in okra. Rindworm damage was also reported from melonworms and pickworms in watermelon.

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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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