Cucurbit downy mildew infects cucumber, watermelon, cantaloupe, honeydew, zucchini, gourd, summer and winter squash and pumpkin. Powdery mildew is best managed with an integrated program including both management tools (resistant varieties and fungicides) that is based on efficacy results from research.
Cucurbit Crop & Disease Management
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Cucurbit Downy Mildew identified in S.C.
According to the South Carolina Grower, cucurbit downy mildew was identified in South Carolina on May 12. The identification came from butternut squash grown in a sentinel plot at the Coastal Research and Education Center in Charleston, South Carolina.
Spider Mites in Florida Watermelons
Spider mites have been observed in North Florida watermelons. While the pest is a common occurrence in dry weather, most are very isolated and require minimal action on the part of the grower.
Whitefly population remains low in Georgia
Vegetables like squash, zucchini, cucumber and snap beans are susceptible to viruses transmitted by whiteflies.
Cucurbit Downy Mildew found in SC
Cucurbit downy mildew was identified in South Carolina on 5/12/23. The identification came from butternut squash grown in a sentinel plot at the Coastal REC in Charleston.
SC Grower Weekly Report | May 15, 2023
In the Coastal region, squash, and cukes continue to be harvested in heavy volumes.
In the Midlands, squash are fairing well with a few squash bugs here and there. The biggest problem so far has been wind damage and breakage.
In the Pee Dee region, Summer crops (peppers, tomatoes, watermelon, cucumbers, squash, sweet corn, etc.) are growing well and are still being planted heavily.
Preventitive sprays help hold Powdery Mildew at bay
For producers who are actively scouting for the disease, symptoms start as circular yellow areas on the leaves. As the infection progresses, growth of the fungus appears and can be observed on the underside of the leaves. “White powder” can be viewed on both surfaces of the leaves and stems as the tissue decays.
SC Grower weekly report | May 8, 2023
The South Carolina Grower is a weekly report with news and updates from Clemson University Extension Specialists and Agents. The May report shared links to crop and disease management articles from CucCAP Plant Pathologist Anthony Keinath.