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South Carolina Grower Update | June 3, 2024

June 5, 2024August 5, 2024 cuccap Cucurbit Crop & Disease Management Resources

Tony Keinath, Extension Plant Pathologist reported that powdery mildew was found this week on watermelons at the Edisto Research and Education center.

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Downy Mildew reported on Cucumbers

June 5, 2024August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew on cucumbers was reported on May 31 in Charleston County, SC and less than a week later CDM was reported in Sampson County, NC

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CucCAP scientists develop genomic and pan-genomic resources for bottle gourd and identify novel genes associated with biotic and abiotic resistances

June 1, 2024June 25, 2024 cuccap CucCAP Genomics & Bioinformatics Team, CucCAP Watermelon Team, Featured Articles

Highly differentiated genomic regions among different populations harbor many genes related to disease resistance and stress tolerance, potentially contributing to their local adaptations.

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Disease resistance is one tool available to growers

May 24, 2024 cuccap Cucurbit Crop & Disease Management Resources

A plant’s genetic resistance to diseases is something researchers actively pursue across the country.

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Michigan Cucurbit update | May 22, 2024

May 23, 2024August 15, 2024 cuccap Cucurbit Crop & Disease Management Resources

Pumpkins planted with plastic mulch tend to grow faster. This may may result in longer powdery mildew foliage management to protect fruit from sunburn.

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South Carolina Grower Update | May 13, 2024

May 23, 2024August 15, 2024 cuccap Cucurbit Crop & Disease Management Resources

Cucrubit downy mildew was found on Cucumbers in Charleston SC.

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Aggressive downy mildew infection in Florida and Georgia

May 22, 2024May 29, 2024 cuccap Cucurbit Crop & Disease Management Resources

Extension specialists want growers to have a heightened alert and to intensify scouting when we indicate alerts for any of these diseases or other pests.

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Late Georgia watermelon crop faces challenges

May 21, 2024August 15, 2024 cuccap Cucurbit Crop & Disease Management Resources

Watermelon diseases respond to weather conditions consistent with heavy moisture which was the case in Georgia recently. Tissue samples from fields are being analysed for Gummy stem blight and Fusarium. Disease management is going to be imperative.

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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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