Powdery mildew was reported on pumpkins and hard squash across the state. Downy mildew spores have been detected in all spore traps in the state’s network.
American Vegetable grower magazine shared results of a recent nationwide survey. This article presents a slide show of the survey results. Powdery mildew is the top pest across five out of six U.S. regions, downy mildew topped powdery mildew by one percentage point in the Southeast.
South Carolina Cooperative Extension agents report on Powdery mildew and Downy mildew in squash.
UF/IFAS Extension reports on disease priorities for Florida cucurbit growers. Management of Downy mildew, gummy stem blight, and powdery mildew management on watermelon and cantalope.
Symptoms of the disease on watermelon plants appear as yellow blotches on the oldest leaves first.
Florida has a rapid diagnostic program in place for farmers to use. If they suspect that their crop has powdery mildew, the grower should reach out to their county Extension agent who will help them send a sample to the lab.
Powdery mildew prefers conditions where there is high humidity and abundant plant growth.
CucCAP plant pathologist, Anthony Keinath published a watermelon fungicide guide for 2022.