Persistent rains in the North Florida region amid the current El Niño weather pattern is a potential concern for the region’s watermelon producers.
Gummy stem blight
CucCAP scientists study pathogen resistances to watermelon fungicides
Watermelon is affected several pathogens and pests that are frequently controlled by SDHI compounds. Scientists from North Carolina State University compared the sensitivity of the different pathogens to various SDHIs.
South Florida Pest and Disease Hotline | Oct. 18, 2023
In Central Florida, reports indicate incidence of Cucurbit downy mildew (Pseudoperonospora cubensis) is increasing and Cucurbit leaf crumple virus (CuLCrV) incidence is very low.
In Southwest Florida, CuLCrV, Squash Vein Yellowing Virus and Cucurbit Yellow Stunting Disorder Virus were diagnosed. Gummy stem blight was reported on watermelons in older watermelon fields.
In Southwest Florida, Very low infestation levels of Cucurbit Downy Mildew were reported by field scouts.
South Florida pest and disease hotline | September 2023
Virus, whitefly, Gummy Stem Blight, Pythium, Choanephora, and other pest reports from University of Florida
CucCAP scientists find high prevalence of gummy stem blight resistance to common fungicides
The gummy stem blight fungus, Stagonosporopsis citrulli, is now resistant to fungicides in four chemical classes. The newest resistance is to fungicides in FRAC Code 3.
Clemson field updates | June 26, 2023
Summer squash is being harvested. Growers are seeing some internal ripening issues in squash and agents suspect it to be a seed issue. Squash vine borers have started showing up in spots. Foliar diseases such as gummy stem blight in cucurbits are beginning to take off,.
S.C. Field Update | June 19, 2023
Squash, cucumbers zucchini are all coming to market. Watermelons and Cantaloupe will be following very soon. Downy mildew is active in all cucurbits. Rotating materials is crucial to prevent resistance. Gummy stem blight is also very active in cucurbits.
Gummy Stem Blight resistant to multiple fungicides
Gummy stem blight on watermelon is on the FRAC “most wanted” list of pathogens at high risk of becoming resistant to multiple fungicides.