“Downy mildew continues to circulate in many parts of Southwestern Ontario, and in American states around the Great Lakes.”
“Downy Mildew was identified today in a commercial cucumber field in Kent County, Ontario. The disease had previously been identified in the Great Lakes area, in Michigan on June 22nd. Risk remains high now that the disease has been confirmed in Ontario despite hot, dry weather.”
Cucumber downy mildew has NOT been identified in Ontario, but the risk is high. Growers are advised to use a downy mildew specific fungicide program, if this hasn’t been started.
The 2018 Cucumber Downy Mildew Control Strategy has a list of the most effective downy mildew control products registered for use in Ontario. It also includes information on spray scheduling and timing. Cucurbit Downy Mildew Update – July 26, 2018
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
This article is an updated version of ‘2016 University of Guelph Cucumber Downy Mildew Results’ by Elaine Roddy, which first appeared May 1, 2017. In 2016 and 2017, Cheryl Trueman compared several different cucumber downy mildew control programs in plots at the University of Guelph Ridgetown Campus. Read More about Comparison of fungicide programs
Late-July to early-August is the key time for powdery mildew management!
Risk of downy mildew to cucumbers and cantaloupe remains high.