Michael Mazourek

Cucurbit downy mildew (CDM) (Pseudoperonosporacubensis), is a serious disease of cucurbits worldwide that attacks all cultivated cucurbits. Symptoms progress from yellow, angular lesions on the upper leaf surfaces restricted by leaf veins to the production of gray sporangia that can be seen on the lower leaf surface. Lesions expand, become necrotic, and kill the leaves.…