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Cucurbit Downy Mildew

Deer beat Powdery & Downy mildew for #1 vegetable pest

August 7, 2023December 1, 2023 cuccap Cucurbit Crop & Disease Management Resources

The American Vegetable Grower online magazine included wildlife pests for the first time in the 2023 production portion of the annual State of the Vegetable Industry survey. Deer bumped powdery mildew disease, the pest frontrunner in previous years, down the list.

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Cucurbit Downy Mildew updates July 28, 2023 | ipmPIPE

July 29, 2023August 15, 2023 cuccap Cucurbit Crop & Disease Management Resources

Epidemic Updates for July 23– July 28, 2023

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Downy Mildew on Cucumber in Western NC

July 28, 2023September 29, 2023 cuccap Cucurbit Crop & Disease Management Resources

Cucumber downy mildew was confirmed on cucumber plants in a research plot in western NC. Water-soaked lesions on the leaves were observed with  gray to black spores on the underside of the leaf. Very light yellow spots or lesions were observed on the upper sides of leaves.

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Michigan Cucurbit update | July 26, 2023

July 26, 2023August 21, 2023 cuccap Cucurbit Crop & Disease Management Resources

Reports of virus symptoms in squash were received this week. Cucurbit downy mildew disease on pickling cucumber plants in a commercial production field were verified by the MSU vegetable pathology lab. Look for weekly spore trap updates and current downy mildew news on the Hausbeck Lab Downy Mildew News website.

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Cucurbit Downy Mildew updates July 23, 2023 | ipmPIPE

July 23, 2023August 29, 2023 cuccap Cucurbit Crop & Disease Management Resources

CDM Epidemic Updates for July 18 – July 23, 2023

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Cucurbit downy mildew in Michigan

July 20, 2023September 29, 2023 cuccap Cucurbit Crop & Disease Management Resources

The first symptoms of cucurbit downy mildew disease on pickling cucumber plants in a commercial production field have been verifiedby qPCR in the Saginaw County lab on July 19, 2023. The statewide spore trapping network to detect downy mildew spores in the air has had positives in multiple counties.

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Cucurbit Downy Mildew updates July 17, 2023 | ipmPIPE

July 18, 2023September 29, 2023 cuccap Cucurbit Crop & Disease Management Resources

CDM Epidemic Updates for July 10 – July 17, 2023

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Cucumber Cultivar Response to Downy Mildew

July 15, 2023August 9, 2024 cuccap CucCAP Disease Management Team

Cucumber cultivar response to Downy mildew in South Carolina variety trials.

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Featured Article

CucCAP scientists use cucumber core collection to map fruit quality traits

The CucCAP core collection, comprised of 388 accessions representing >96% of the genetic diversity for cucumber present in the U.S. National Plant Germplasm System, harbors important sources of disease resistance. As sources of resistance are often present in germplasm with poor fruit quality, scientists from Michigan State University characterized the collection for fifteen fruit quality traits. Genetic associations (QTL) for each trait were identified from genome-wide association studies (GWAS). Many of the genetic locations were in close vicinity to previously identified fruit trait QTL and candidate genes; several novel loci and genes potentially important for these traits were also identified.

For further reading:

Lin YC, Weng Y, Fei Z, Grumet R. 2025. Mining the cucumber core collection: phenotypic and genetic characterization of morphological diversity for fruit quality characteristics. Horticulture Research 12:uhae340.

 

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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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