Cucumber Downy Mildew (CDM) has been confirmed on cucumber samples from our sentinel plot in Waynesville, NC (Haywood County) and from commercial growers in Burke and Henderson Counties. Approximately 75-100% of plants were affected. Leaves showed symptoms typical of CDM: angular, chlorotic or yellow lesions on the upper surface of the leaves with gray to […]
Disease outbreaks
Disease incidents reported by Plant Pathologists in the United States.
Cucumber downy mildew disease confirmed in research plot in southwest Michigan | MSU Vegetable Extension
Downy mildew on cucumber has developed in a small research plot at the Southwest Research and Extension Center in Benton Harbor, Michigan. This is the first confirmed report in Michigan in 2019. Disease symptoms developed over the last several days and this research plot had not been sprayed with any fungicides. Continue Reading
Cucurbit Downy Mildew ipmPIPE July epidemic updates
The Cucurbit downy mildew forecast is provided by the North Carolina State University departments of Plant Pathology & Marine, Earth, and Atmospheric Sciences. The website provides a map of recent outbreaks and lists outbreaks. Outbreaks for June & July 2019 are listed. July 11 – Cucurbit Downy Mildew has been confirmed in Accomack and Chesterfield […]
Cucurbit Downy Mildew ipmPIPE epidemic updates
The Cucurbit downy mildew forecast is provided by the North Carolina State University departments of Plant Pathology & Marine, Earth, and Atmospheric Sciences. The website provides a map of recent outbreaks and lists outbreaks. Outbreaks for May & June 2019 are listed. 17 June: New report from GA. CDM has been confirmed in Ben Hill […]
Cucumber downy mildew detected in NC | NC State
Characteristic symptoms include angular, chlorotic lesions on the upper surface of cucurbit leaves and gray sporulation on the underside of the leaves. Sporangiophore structures typical of Pseudoperonospora cubensis, causal agent of CDM, can be observed using a hand lens or under a dissecting microscope. Continue Reading
2018 Cucurbit Downy Mildew Epidemic History | ipmPIPE & Melcast update
Epidemic Updates: October 7: First report from ME. CDM has been confirmed on jack-o-lantern pumpkin in a field in Penobscot County, ME. Incidence is 100%; severity is 80%. Estimated date of first symptoms is September 21. September 26: New report from MS. CDM has been discovered on acorn squash, cucumber, watermelon, cantaloupe, and butternut squash […]
Occurrence of Foliar Pathogens of Watermelon on Commercial Farms in South Carolina Estimated with Stratified Cluster Sampling | APS Journals
A survey of foliar pathogens of watermelon based on two-stage cluster sampling was conducted on commercial farms in South Carolina in spring 2015, spring and fall 2016, and fall 2017. In total, 60 fields from 27 different growers in seven counties representing the main watermelon-producing areas in the state were sampled, using a stratified two-stage […]
August 31 Vegetable Production Update | NC State
Powdery Mildew on cucumber and squash in Western North Carolina Powdery Mildew is caused by the fungal pathogens Podosphaera xanthii and Erysiphe cichoracearum. Disease can occur on all cucurbit crops. However, due to the incorporation of resistance genes, most commercial cucumber and melon cultivars are less susceptible. High-humidity (50-90%), moderate temperatures (68 to 80 ℉), dense foliage, and […]
