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    • Project Overview
    • Meet the CucCAP Project Team
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  • Crop & Disease management
    • Cucumber Disease Management
    • Melon Disease Management
    • Squash Disease Management
    • Watermelon Disease Management
    • Integrated Disease Management
  • Breeding & Genomics
    • Development of Genomic Tools for Cucurbit Species
    • Cucurbit Genomics Database
    • Cucurbit Breeding
    • Breeding Cucumber for Disease Resistance
    • Breeding Melon for Disease Resistance
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    • Breeding Watermelon for Disease Resistance
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Morning Ag Clips

USDA AMS Revises Standards for Watermelon

September 2, 2021December 13, 2022 cuccap Cucurbit Crop & Disease Management Resources

AMS is establishing a total tolerance for anthracnose and decay in the U.S. No. 1 and U.S. No. 2 grades.

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Downy mildew confirmed in Michigan

July 24, 2021December 13, 2022 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

Downy mildew has been confirmed on cucumbers in four Michigan counties. CucCAP vegetable pathologist, Mary Hausbeck recommended that cucumber growers take agressive action due to recent humid conditions and presence of cucurbit downy mildew spores.

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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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USDA seeks nominees for National Watermelon Promotion Board

January 2, 2020July 19, 2021 cuccap Cucurbit Crop & Disease Management Resources

The U.S. Department of Agriculture (USDA) announced today that it is seeking nominations of qualified watermelon producers and handlers for four seats on the National Watermelon Promotion Board.

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McGregor Lab part of research study aimed at whitefly management

October 10, 2019September 26, 2023 cuccap CucCAP Project

The McGregor Lab at UGA will collaborate with researchers from three research institutions to use a grant from the USDA to fight whiteflies on vegetable crops. Cecilia McGregor and her lab group will be involved with research on Plant resistant traits and Molecular tools & biotechnology.

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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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