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.
Gummy stem blight
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.
Protect Against Gummy Stem Blight
It is never too early for watermelon producers in the Southeast to start thinking about management options for gummy stem blight disease. As Clemson Extension vegetable pathologist Tony Keinath puts it, “Early is on time.”
South Florida Pest and Disease Hotline
South Florida Pest and Disease Hotline scouting report for November 22, 2022 including updates on Whiteflies, Aphids, Viruses,
Gummy Stem Blight, and Oomycete Diseases.
Georgia vegetable disease update | AgNet Media
Cucurbit diseases such as downy mildew, powdery mildew, and gummy stem blight thrive in moist conditions. The current hot and dry weather conditions in Georgia have meant reduced disease pressure, which is normally prevalent this time of year.
South Florida Pest and Disease news
The South Florida Pest and Disease Hotline is a newsletter published by Florida Extension Agents. In October, the newsletter reported on crop damage caused by Hurricane Ian, whitefly observations on watermelons, Cucurbit leaf crumple virus in watermelons, and reports of gummy stem blight on watermelon in Southwest Florida.
