Powdery Mildew on cucumber and squash in Western North Carolina Powdery Mildew is caused by the fungal pathogens Podosphaera xanthii and Erysiphe cichoracearum. Disease can occur on all cucurbit crops. However, due to the incorporation of resistance genes, most commercial cucumber and melon cultivars are less susceptible. High-humidity (50-90%), moderate temperatures (68 to 80 ℉), dense foliage, and […]
West central Michigan vegetable update – Aug. 3, 2018 In cucurbits, cucurbit downy mildew was detected at additional sites in southwest Michigan as well as in Saginaw and Arenac counties over the last week; it is on the move and cucumbers and melons need to be protected. Phytophthora capsici was causing fruit rot and leaf lesions in […]
Southwest Michigan vegetable update – Aug. 1, 2018 Cucurbit downy mildew is now present throughout the area, so a tighter spray schedule with more effective products is advised. Morning dew conditions will continue to be conducive for powdery mildew spread. Read more. Southeast Michigan vegetable update – Aug. 1, 2018 In cucumbers, downy mildew reports continue to roll […]
Downy Mildew Epidemic Updates 1 August: Lagrange County, IN on Cucumber; Suffolk, VA on Butternut squash. 31 July: First reports from TN and MI; new reports from PA and NJ. CDM had been confirmed in Knox County, TN; Berrien County, MI; Lancaster County, PA; and Hunterdon County, NJ. on cucumber; Cumberland County, NJ: on jack-o-lantern type Pumpkin. […]
Growers on the west side of Michigan should consider fungicide sprays for cucumbers and melons (watermelons, cantaloupe, muskmelon) now that downy mildew has been verified in Berrien County on July 24, 2018. Read this article from MSU Extension about the downy mildew outbreak.
East Michigan vegetable update – July 25, 2018 Pumpkins and winter squash are setting fruit and sizing quickly. Powdery mildew is just starting to show up, and some fields are looking a little baked from the weeks of hot, dry weather. Cantaloupe and watermelon are hitting stands in force. Quality is very good, but fruit size is smaller on unirrigated ground. […]
FROM Extension Plant Pathology: Cucurbit downy mildew (CDM) was confirmed on a cucumber leaf from a commercial field in Henderson County on July 20, 2018. This is the first report of CDM in western NC. Read more about the first report of CDM in western N.C. this year.
If you suspect downy mildew in your field, please report it to OMAFRA so we can ensure that the ipmPIPEforecasts are accurate and up-to-date. Cucurbit Downy Mildew Update – July 18, 2018