Growing isn't always easy. When plant problems present themselves, you can count on WVU Extension specialists and agents for trusted, research-based advice. Learn about common plant diseases.Browse the Plant Disease Identification Guide
Extension experts help identify, prevent and find solutions to recover from stress, injury and disease in all types of plants. Contact the WVU Extension when your plants get sick.
Plant Disease Identification Guide
Plant Diagnostic Clinic
Contact the Clinic
WVU Plant Diagnostic ClinicG102 South Agricultural Sciences
Morgantown, WV 26506-6108
Email Mahfuz Rahman
Monday - Friday | 8:15 a.m. - 4:45 p.m.
Closed on WVU Holidays
Collect & Submit Plant Samples
Take & Submit a Plant Sample
Active Plant Disease Alerts
AgAlert! Cucurbit Downy Mildew
Cucurbit downy mildew (CDM) has now been found in Monongalia County, West Virginia, as well as neighboring states – Virginia, Pennsylvania, Ohio and Maryland. For the latest information, visit the CDM regional map at https://cdm.ipmpipe.org/.
Cucurbit downy mildew (CDM) is a destructive disease that can affect most members of the gourd family or Cucurbitaceae, such as cucumber, cantaloupe, pumpkin, squash, watermelon and zucchini. However, cucumbers are the worst affected cucurbit that can be completely killed in two weeks from the onset of the disease.
Symptoms of the disease may vary slightly from species to species, but in general, it causes angular chlorotic lesions on the foliage. These lesions appear angular because they are bound by leaf veins. During humid conditions, the lower surface of the leaf is covered with a downy, pale gray to blackish mildew.
If you see or suspect a new plant disease outbreak that's not currently reported here, please contact Mahfuz Rahman with the WVU Plant Diagnostic Clinic or your local county Extension agent, immediately.