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    • Cucumber Disease Management
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    • Development of Genomic Tools for Cucurbit Species
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Whitefly vectored plant virus

A number of whitefly-transmitted viruses, including cucurbit leaf crumple virus, cucurbit yellow stunting disorder virus, cucurbit chlorotic yellows virus, and squash vein yellowing virus, are able to infect and cause losses in cucurbit crops.

Florida cucurbit pest and disease reports

January 11, 2022June 2, 2022 cuccap Cucurbit Crop & Disease Management Resources

The January South Florida Pest and disease hotline reported that Whitefly pressure continues to range from low to moderate. Cucurbit downy mildew and powdery mildew are active in squash and cucumbers.

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Whitefly Pressure Varies Across Florida

November 15, 2021November 23, 2021 cuccap Cucurbit Crop & Disease Management Resources

The Southwest Florida Pest and disease hotline reports from growers and scouts in Florida on whitefly numbers for adults and nymphs in cucurbits and other vegetable crops. In Southwest Florida, low levels of virus are present in melons.

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Fall Watermelon Production Not Recommended in North Florida

October 21, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

University of Florida Institute of Food and Agricultural Sciences scientists do not recommend that Florida watermelon growers grow watermelons in the fall. This assessment is attributed to the multiple variables growers must overcome including weather, high disease pressure and whitefly infestations.

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Whitefly infestations vary across Florida

October 14, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

The October newsletter from the South Florida Pest and Disease Hotline reports that whitefly infestations are widely present across central Florida. They are low to moderate in cucumber and squash. Populations are very low in watermelon.

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Whiteflies a Factor in South Florida Crops

September 28, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

According to the South Florida Pest and Disease Hotline, up to eight whitefly adults have been observed on melons in the Immokalee, Florida area. Scouts report between 15% to 60% of plants having one or multiple adults.

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Florida vegetable specialist recommend virus prevention strategy

September 2, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Whiteflies cause feeding injury issues in vegetables and transmit two viruses: cucurbit leaf crumple virus and cucurbit yellow stunting disorder virus. Sanitation of vegetable crops susceptible to whiteflies remains a key management strategy for Florida producers.

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Whiteflies Vary in Impact in Florida Vegetables This Fall | VSCNews

October 28, 2020August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Growers and scouts in Southwest Florida report that whitefly pressure has declined with recent rains.

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South Carolina Grower Update | Sept. 21, 2020

September 22, 2020August 5, 2024 cuccap Cucurbit Crop & Disease Management Resources

Clemson Cooperative Extension reports whitefly damage on squash in this weeks issue of “The South Carolina Grower Fruit and Vegetable News”.

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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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