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CDM ipmPiPE

The ipmPIPE is a pest mapping and forecasting system that was developed by the National Institute for Food and Agriculture (NIFA) and its land-grant partners.

Reporting Cucurbit Downy Mildew

February 17, 2022February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

The CDM ipmPIPE website provides a place for Cucurbit Growers, Plant Pathologists, and Extension Agents to report incidents of Cucurbit Downy Mildew.

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Cucurbit Downy Mildew epidemic update November 2021 | ipmPIPE

November 15, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

The ipmPIPE published their final forecast for the 2021 growing season on October 29, 2021.

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Cucurbit Downy Mildew epidemic updates October 2021 | ipmPIPE

October 15, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

Epidemic updates include DM on pumpkin, summer squash, watermelon, and butternut squash in MA, Ms, PA, OH, NC, CT, and NY.

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Cucurbit Downy Mildew epidemic updates September 2021 | ipmPIPE

September 17, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

New reports of CDM on butternut squash, acorn squash, pumpkin, zucchini, summer squash and cucumber.

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Cucurbit Downy Mildew epidemic updates August 2021 | ipmPIPE

September 2, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

New reports of CDM on pumpkin, cantaloupe, cucumber, and butternut squash, in the southeast, northeast, and midwest.

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Cucurbit Downy Mildew epidemic updates August 2021 | ipmPIPE

August 18, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

Recent outbreaks of CDM for the period from July 21, 2021 to August 18, 2021.

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Cucurbit Downy Mildew epidemic updates July 2021 | ipmPIPE

July 20, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

Epidemic Status Map and updates for CDM (Pseudoperonospora cubensis).

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Cucurbit Downy Mildew epidemic updates June 2021 | ipmPIPE

June 17, 2021February 18, 2022 cuccap Cucurbit Crop & Disease Management Resources

Recent Updates: June 16: First reports from NC and MS. CDM has been confirmed on cucumber in Lenoir County, NC; and on cucumber and cantaloupe in Kemper County, MS.

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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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