Epidemic Updates: October 7: First report from ME. CDM has been confirmed on jack-o-lantern pumpkin in a field in Penobscot County, ME. Incidence is 100%; severity is 80%. Estimated date of first symptoms is September 21. September 26: New report from MS. CDM has been discovered on acorn squash, cucumber, watermelon, cantaloupe, and butternut squash […]
A survey of foliar pathogens of watermelon based on two-stage cluster sampling was conducted on commercial farms in South Carolina in spring 2015, spring and fall 2016, and fall 2017. In total, 60 fields from 27 different growers in seven counties representing the main watermelon-producing areas in the state were sampled, using a stratified two-stage […]
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. […]