Cucurbit downy mildew was reported today (June 6, 2017) in commercial cucumber fields in Duplin County, North Carolina and Horry County, South Carolina and confirmed by the Quesada Lab at NCSU.
Symptoms were typical of downy mildew, including angular chlorotic lesions on the leaves and a grayish-brown “downy” appearance on the abaxial surface. Structures of the oomycete Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew, were identified using dissecting and compound microscopes, confirming the disease.
