Nov 4, 2019
The MELCAST and ipmPIPE cucurbit disease forecasting tools have discontinued updates for the 2019 growing season.
Aug 21, 2019
Downy mildew on cucumber has been verified in three counties on the west side of Michigan and one county on the east side of Michigan. Cantaloupe crops are also at risk.
Jul 31, 2019
Cucumber Downy Mildew (CDM) has been confirmed on cucumber samples in sentinel plots in NC. Leaves showed symptoms typical of CDM: angular, chlorotic or yellow lesions on the upper surface of the leaves with gray to black spores on the underside of the leaf.
Jul 29, 2019
Downy mildew on cucumber has developed in a small research plot at the Southwest Research and Extension Center in Benton Harbor, Michigan. This is the first confirmed report in Michigan in 2019.
Jul 13, 2019
CDM was reported between June 20 and July 11 in VA, NJ, AL, MD, NC, and GA on cucumber, butternut squash, and watermelon.
Jun 17, 2019
CDM outbreaks for May & June 2019 were reported in GA, SC, NC, and FL.
Jun 13, 2019
Characteristic symptoms include angular, chlorotic lesions on the upper surface of cucurbit leaves and gray sporulation on the underside of the leaves. Sporangiophore structures typical of Pseudoperonospora cubensis, causal agent of CDM, can be observed using a hand lens or under a dissecting microscope.
Oct 7, 2018
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…
Sep 12, 2018
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…
Aug 31, 2018
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 ℉),…