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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
    • Breeding Squash for Disease Resistance
    • Breeding Watermelon for Disease Resistance
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The South Florida Pest and Disease Hotline

The South Florida Pest and Disease Hotline shares vegetable scouting reports, research highlights, weather and crop reports, and is compiled by UF / IFAS Extension Agents. This report is sent to the vegetable industry every 3 weeks to highlight pest and disease populations and trends across five locations in south Florida.

Whiteflies reported in South Florida

April 7, 2022November 2, 2022 cuccap Cucurbit Crop & Disease Management Resources

In the Central Florida area, whitefly populations are increasing yet remain low in squash.In SW Florida, growers and scouts are reporting high levels of whitefly adults and nymphs in melons, and squash.
On the East Coast, whitefly populations are moderate in cucumber. Reports from Homestead indicate that whitefly populations are mostly sporadic in squash.

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Whitefly Pressure Varies Across Florida

March 22, 2022November 2, 2022 cuccap Cucurbit Crop & Disease Management Resources

Whitefly pressure has been increasing to high levels in Southern Florida which is normal at this time of year. Whiteflies are vectors for viruses. Management of whiteflies later in the season depends on early suppression of whitefly populations.

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Vectors and disease present in Florida cucurbits

February 22, 2022March 22, 2022 cuccap Cucurbit Crop & Disease Management Resources

Florida cucurbit growers are reporting whiteflies, gummy stem blight, powdery mildew, and cucurbit downy mildew.

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Downy Mildew & Powdery Mildew on Florida Squash

February 1, 2022February 23, 2022 cuccap Cucurbit Crop & Disease Management Resources

The January 31, 2022 edition of The South Florida Pest and Disease Hotline reported widespread issues with downy mildew in squash in South Florida. Downy mildew is also widely present in Homestead on squash and oriental cucurbits.

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Florida Cucurbit pest report for January 2022

January 31, 2022October 13, 2023 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew and virus causing whiteflies threaten cucurbits in Florida in January 2022.

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Sanitation Important Management Tool

June 1, 2021August 27, 2024 cuccap Cucurbit Crop & Disease Management Resources

Downy mildew and powdery mildew on melons can spread from older, diseased plants to surrounding fields where plants are still maturing.

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Virus transmitting Whiteflies in Florida and Georgia | VSCNews

September 29, 2020October 14, 2023 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.

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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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