Cucurbit Downy Mildew was detected in Indiana, Maryland, Pennsylvania, New Hampshire, North Carolina, Delaware, Virginia, and New Jersey in August 2023.
Cucurbit disease and pest reports
Cucurbit crop diseases and pests are reported in newsletters and forecasting sites by crop producers, Extension Agents, and Plant Pathologists from many regions in the United States.
Whitefly populations are on the rise
University of Georgia (UGA) Cooperative Extension vegetable entomologists describe squash plants that haven’t sprayed yet with 100 whiteflys per leaf.
Michigan Cucurbit update | August 18, 2023
Cucurbit downy mildew has been reported in multiple locations in Michigan. Michigan cucurbit growers are warned to detect and disk under plants infected with Phytophthora.
Cucurbit Downy Mildew updates August 14, 2023 | ipmPIPE
📢New reports of Cucurbit Downy Mildew on cucumber🥒, butternut, and pumpkins🎃 in Massachusetts, Pennsylvania, North Carolina, Michigan, Maryland, New York, Tennessee, and Alabama📢 from July 28 to August 9, 2023.
Downy Mildew on Pumpkins in Ohio
Clade 1 of the downy mildew pathogen has a broad host range among cucurbits, preferring pumpkins, squash and watermelons. Clade 2 isolates infect and cause damage to cucumbers and melons, and are seen in northern Ohio first. As in 2022, the Fulton County outbreak on pumpkins was unusual for the Great Lakes region.
Whitefly populations low across Southeast
Whiteflies can cause feeding injury issues in vegetables and transmit multiple viruses. These include cucurbit leaf crumple virus, cucurbit yellow stunting disorder virus, cucurbit chlorotic yellow virus, squash vein yellowing virus and tomato yellow leaf curl virus. Vegetables like squash, zucchini, cucumber, and cantaloupe are highly susceptible to these viruses.
Cucurbit Downy Mildew updates July 28, 2023 | ipmPIPE
Downy Mildew on Cucumber in Western NC
Cucumber downy mildew was confirmed on cucumber plants in a research plot in western NC. Water-soaked lesions on the leaves were observed with gray to black spores on the underside of the leaf. Very light yellow spots or lesions were observed on the upper sides of leaves.