CDM was found on cantalope, pumpkin, and cucumber in Virginia, Massachusetts, and Kentucky in early August.
Michigan Cucurbit update | August 14, 2024
Cucurbit crops are being harvested, pumpkins are sizing as powdery mildew settles in across the state. Plectosporium blight can also be found. Stay vigilant against downy mildew and Phytophthora pathogens.
Cucurbit Genetics Cooperative report #48 | call for papers
Reports should be sent via email to Amnon Levi at the USDA,ARS Vegetable Laboratory by March 15th, 2025.
UK Extension Factsheet: Cucurbit Downy Mildew in Kentucky
The Factsheet: Cucurbit Downy Mildew in Kentucky (PPFS-VG-27) is available online. For additional publications on vegetable diseases, visit the UK Plant Pathology Extension Publications webpage.
CDM confirmed in Central Kentucky
On August 9, 2024 cucurbit downy mildew was confirmed on cucumber in south-central Kentucky. Cucurbit downy mildew has also been reported in neighboring states. Disease is expected to become widespread across the area.
Downy mildew confirmed on cucumber in western NC
Water-soaked lesions on the undersides of leaves were observed with signs of the pathogen — gray to black spores on the underside of the leaf. Very light yellow spots or lesions were observed on the upper sides of leaves. At the moment, downy mildew has not been observed on any other cucurbit in western NC.
Downy mildew and Phytophthora threaten Michigan Cucurbits
Cucurbit crops, excluding pumpkins, are being harvested, with vigilance against downy mildew and Phytophthora pathogens. Downy mildew has been confirmed in 13 Michigan counties, affecting cucumber and melon crops. Phytophthora symptoms are expected to increase following recent rains, impacting plant crowns and fruit.
Whitefly Damage on Cucurbit leaves
Unique silvering of the leaves is the characteristic symptom induced by feeding of immature stages of silver leaf whitefly which releases a toxin inducing the unique pattern on the leaves.
