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Author: cuccap

Phytophthora capsici in irrigation water

June 23, 2023June 23, 2023 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

CucCAP vegetable pathologist Dr. Mary Hausbeck discusses how Phytophthora capsici can be introduced to crops when irrigating vegetables with surface water during dry conditions.

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Downy mildew on Cucumber in NC

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

Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew (CDM) was confirmed in Lenoir County on cucumbers this week.

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Florida watermelon harvest continues

June 22, 2023August 15, 2024 cuccap Cucurbit Crop & Disease Management Resources

North Florida watermelon producers are close to being done harvesting this year’s crop.

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U.S. watermelon supply up 7.3 % in 2023

June 22, 2023November 1, 2023 cuccap CucCAP Project Partners

U.S. watermelon supply is looking stronger this season with a 7.3 % year-on-year increase in volume reaching 2.3 billion pounds as of June 11.

U.S. production usually goes from April to September with its peak between July and August.

With nearly 400 varieties of watermelon available, the leading segment for the past 30 years has been seedless.

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Early Career Scientist Spotlight | Anju Biswas

June 22, 2023June 29, 2023 cuccap CucCAP Watermelon Team

Anju Biswas is a Post Doctoral fellow in the USDA-ARS-ORISE program at the U. S. Vegetable Laboratory at Charleston, SC.  Her mentor is CucCAP Watermelon Team leader, Dr. Amnon Levi. The focus of her work is plant breeding, plant pathology, and genomics.

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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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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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