“Downy mildew pressure remains high, and has now been confirmed on cucumbers as far North as Wellington county. Early detection of downy mildew this year increases the possibility of fungicide resistance.”
ONvegetables
Ontario Vegetable crop reports for July 30th, 2020
“Examine low lying or poorly drained areas noting any wilted or stunted plants, and look for lesions. Phytophthora usually presents as a foliar blight or a crown rot in zucchini, squash, and pumpkin, so look for dark lesions on the crown. In cucumbers and melons Phytophthora usually causes fruit and stem lesions so look for water soaked lesions with white spores developing on the fruit.”
Ontario Vegetable Crop Report for July 23rd, 2020
“Downy mildew continues to circulate in many parts of Southwestern Ontario, and in American states around the Great Lakes.”
Cucumber Downy Mildew has now been Confirmed in Ontario
“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 Confirmed in the Great Lakes Region
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.
2018 Downy Mildew Control Strategy for Cucumber Crops
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
July 2018 Cucurbit Downy Mildew Update
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
Ontario research Cucumber Downy Mildew Results
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
