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    • Cucumber Disease Management
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    • Development of Genomic Tools for Cucurbit Species
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Proper Sanitation Remains Key Management Tactic Against Whiteflies | VSCNews

September 2, 2020August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Whiteflies cause feeding injury issues in vegetables and transmit two new viruses: cucurbit leaf crumple virus and cucurbit yellow stunting disorder virus.

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Clemson Extension Agents Provide Crop Updates | VSC News

September 1, 2020July 7, 2022 cuccap Cucurbit Crop & Disease Management Resources

“Fall crops are continuing to progress well, though we are continuing to see a fair amount of disease like anthracnose, downy mildew, and bacterial spot due to the recent wet conditions.”

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CUCCAP 2 Grant proposal at USDA

September 1, 2020January 10, 2022 cuccap CucCAP Project

Non-Technical summary of the CucCAP #2 grant proposal posted on the USDA NIFA portal.

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USDA Project Summary for the second CucCAP grant

September 1, 2020June 12, 2024 cuccap CucCAP Project

CucCAP 2: HARNESSING GENOMIC RESOURCES FOR DISEASE RESISTANCE AND MANAGEMENT IN CUCURBIT CROPS – BRINGING THE TOOLS TO THE FIELD is a grant funded by USDA-SCRI. The project start date is Sep 1, 2020 and the project end date is August 31, 2024.

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Whitefly-Transmitted Yellowing Viruses of Cucurbit Crops​​ | APS

August 30, 2020December 16, 2020 cuccap CucCAP Project

This webcast describes differences in symptoms caused by the whitefly-transmitted viruses known to infect U.S. cucurbit crops and discusses the importance of early virus identification, insect control, and management of weed and alternate crop host plants, as well as the potential for use of resistant varieties.

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Phytophthora roundtable discussion | GLVPN

August 26, 2020September 22, 2021 cuccap CucCAP Disease Management Team, Cucurbit Crop & Disease Management Resources

How can growers living with this devastating disease of cucurbits, peppers and tomatoes produce a harvestable crop? Dr. Smart works on the “Phytophthora farm” at Cornell University, land which is dedicated to researching solutions growers can use to deal with this disease.

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Pumpkin Downy Mildew Found in Surry County, North Carolina | NC State Extension

August 25, 2020September 22, 2021 cuccap CucCAP Disease Management Team

“Pseudoperonospora cubensis has two types of isolates or clades that preferentially infect certain cucurbit crops. In North Carolina, clade 2 isolates preferentially infect cucumbers and cantaloupes, while clade 1 isolates preferentially infect squash, pumpkin, and watermelon.”

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Sunscald of Pumpkin and Winter Squash | Cornell Extension

August 21, 2020September 22, 2021 cuccap Cucurbit Crop & Disease Management Resources

“Sunscald injury starts on the top of fruit, often the part facing the sun during the morning.  Initially the rind may appear water-soaked and will slough off when rubbed.”

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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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