Papaya ringspot virus (PRSV) belongs to the genus Potyvirus, a large and economically important group of plant infecting viruses in the family Potyviridae. PRSV is transmitted in fields by aphids. Insecticide application is not effective for disease control. The most effective and economic management strategy would be through the use of a disease-resistant cultivar. CucCAP’s watermelon […]
Grumet et al.
R. Grumet is the lead PI for the USDA-SCRI CucCAP project: CucCAP: Leveraging applied genomics to increase disease resistance in cucurbit crops. The primary objectives of the CucCAP project are to develop genomic and bioinformatic breeding tool kits for accelerated crop improvement across the Cucurbitaceae; use these tools to facilitate introgression of disease resistance into commercially valuable cucurbit cultivars; and provide readily accessible information to facilitate disease control.
Cucumber mosaic virus
CMV causes a systemic infection in most host plants. Symptoms of cucumber mosaic can vary greatly depending on the crop infected and the age of the plant when infection occurs. For more information about plant viruses visit the Emerging Viruses in Cucurbits Working Group (EVCWG) website and the CucCAP Melon page. Infomation about CMV CucCAP: Breeding Cucumber […]
Cucurbit yellow stunting disorder virus (CYSDV)
Cucurbit yellow stunting disorder is a primarily a disease of cucurbits (e.g., melons, watermelon and squash) and is caused by a plant virus named Cucurbit yellow stunting disorder virus CYSDV; genus Crinivirus, family Closteroviridae. Factsheets Fact sheet from the Emerging viruses in Cucurbits working group Postcard (English) Postcard (Spanish) UC Pest Management Guidelines, California IPM program […]
Crop & Disease Management Publications
Plant Disease Management Reports (PDMR) Cucumber PDMR Melon PDMR Pumpkin & Squash PDMR Watermelon PDMR Cucurbit Disease Factsheets & Websites Hoja Informativa de Patógenos de Vegetales (Spanish Factsheets) Cucurbit Variety Trials Disease Management Articles, Podcasts, & Videos Vegetable Production Guides Variety Trials Plant Disease Management Reports (PDMR) Cucumber (PDMR) Rosado-Rivera, Y. I., Collins, H., and […]
Phytophthora rot on watermelon
Phytophthora capsici: In watermelon, Phytophthora capsici primarily infects either seedlings or fruit, causing fruit rot. P. capsici is favored by rain and warm temperatures and spreads rapidly via water, including irrigation and surface water sources. The pathogen can overwinter in the soil and spores can persist in infested soil for as long as 10 years. […]
Phytophthora fruit rot on cucumber
Phytophthora capsici In cucumber fields, Phytophthora capsici primarily causes fruit rot and on rare occasions, when the weather is favorable, it can infect cucumber seedlings. Sporangia are formed on infected fruit and have a powdered sugar appearance. Sporulation is favored by rain and warm temperatures. Water management has a high impact on disease development. In the […]
Downy mildew on cucumber
Pseudoperonospora cubensis Downy mildew causes angular, yellow to brown lesions on top of the leaves that are restricted by leaf veins. When conditions are favorable, for example early in the morning when moisture is higher, lesions observed on the underside of the leaf may be covered in dark “down”. This downy growth is masses of […]
Gummy Stem Blight
Stagonosporopsis cucurbitacearum (syn. Didymella bryoniae), Stagonosporopsis citrulli, and Stagonosporopsis caricae Gummy stem blight affects the stems and leaves of cucurbit crops but watermelon is particularly susceptible. On occasion, it can also infect the fruits of squash, which is known as black rot of cucurbits. Infected leaves develop dark brown lesions that are typically located on […]
