Epidemic Status Map and updates for CDM (Pseudoperonospora cubensis).
Watermelon downy mildew was found in two South Carolina counties this week.
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.
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 […]