CDM has been reported in LA, MN, AL, OH, WV, WI, NY, OH. AR, IN, VT, MS, DE, PA, IN, IL, PA, KY, ON, MA, NH, ME, WV, KY, WV, VA, NY, PA, OH, TN, and NC.
“Pseudoperonospora cubensis has two types of isolates or clades that preferentially infect certain cucurbit crops. In North Carolina, clade 2 isolates preferentially infect cucumbers and cantaloupes, while clade 1 isolates preferentially infect squash, pumpkin, and watermelon.”
In July and August, CDM was reported in NC, KY, VA, WV, NY, PA, OH, TN, NJ, CT, IN, KS, ON, IN, KS, ON, QC, MD, MA and AL.
Leaves showed symptoms typical of CDM: angular, chlorotic or yellow lesions on the upper surface of the leaves with gray to black spores on the underside of the leaf. Continue Reading
East Michigan vegetable update – Aug. 12, 2020 Cucumber harvest has stopped on some farms and plants have been pulled. Since downy mildew has become such a regular and expensive disease to control, some farms have just stopped growing later cucumber crops. Melon and watermelon picking has been strong. Pumpkins and most winter squashes are looking very healthy on most farms, with […]
“Downy Mildew was identified today in a commercial cucumber field in Kent County, Ontario. The disease had previously been identified in the Great Lakes area, in Michigan on June 22nd. Risk remains high now that the disease has been confirmed in Ontario despite hot, dry weather.”
Cucumber downy mildew has NOT been identified in Ontario, but the risk is high. Growers are advised to use a downy mildew specific fungicide program, if this hasn’t been started.
The Cucurbit downy mildew forecast is hosted by the NC State University departments of Plant Pathology & Marine, Earth, and Atmospheric Sciences. The website provides a map of recent outbreaks and lists outbreaks. Epidemic Status Map for CDM (Pseudoperonospora cubensis) on – 19 June: View the map. Epidemic Update – 10 June: First report from NC. […]