Downy Mildew | Cornell Vegetables

“Cucurbit downy mildew is a devastating disease in central and eastern United States as well as globally. Cucurbit downy mildew can cause severe losses. It is caused by Pseudoperonospora cubensis, which is an oomycete pathogen, otherwise known as a water mold.”

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disease symptoms in field

Cucurbit downy mildew in a cucumber field with many necrotic and chlorotic lesions