Resistance to Tebuconazole is Widespread in Gummy Stem Blight Fungus in South Carolina

Jim Rogers Disease, South Carolina

South Carolina cucurbit growers should reduce tebuconazole applications in managing gummy stem blight. The pathogenic fungus has become moderately resistant to this very commonly used fungicide, according to Clemson plant pathologist Tony Keinath in The South Carolina Grower. Seven watermelon fields were sampled in 2019 (six fields) and 2021 (one field) in Beaufort, Bamberg, Barnwell and Hampton counties. Of 229 …

Disease Update for North Florida Watermelons

Jim Rogers Disease, Florida, Watermelon

Gummy stem blight remains the main disease threat to North Florida’s watermelons, as harvests continue across the Suwannee Valley. The combination of increased rains and harvest equipment moving through the fields provides better potential for the disease to spread, says Bob Hochmuth, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) regional specialized Extension agent in Live Oak, Florida, …

Delay in Disease Pressure Helps Melon Production, Farmers Save Money

Jim Rogers Disease, Florida, Watermelon

By Clint Thompson The extended delay of certain diseases occurring in North Florida watermelons was a much-needed blessing for producers. The hot and dry conditions were a big reason why. Only last week was the first case of downy mildew observed in Levy County. Gummy stem blight pressure only became problematic within the last couple of weeks. Those diseases thrive …

Options Available for Management of Gummy Stem Blight

Jim Rogers Disease, Watermelon

Gummy stem blight disease pressure has been light so far this season in North Florida watermelons. That trend may soon be changing, however. Bob Hochmuth, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Regional Specialized Extension agent in Live Oak, Florida, confirmed this week that gummy stem blight disease is beginning to become a problem for Florida watermelons. …

South Florida Pest and Disease Hotline: Gummy Stem Blight Concerns

Jim Rogers Cucurbits, Disease, Florida

Gummy stem blight disease has increased in recent weeks in cucurbit fields across southwest Florida, according to the South Florida Pest and Disease Hotline. It has become the predominate disease in some watermelon fields in the area. The disease remains moderate in cucumber crops on the east coast. Gummy stem blight’s symptoms appear as light to dark brown circular spots …

Cucurbit Farmers: Two Diseases Already Observed in North Florida

Jim Rogers Cucurbits, Disease, Research

By Clint Thompson Cucurbit farmers in North Florida, South Georgia and South Alabama need to be wary of certain diseases that are already present in some fields. Mathews Paret, associate professor of plant pathology at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS), describes what growers should be concerned about with regards to angular leaf spot and …

Attention North Florida Watermelon Producers: Diseases Observed in Isolated Fields

Jim Rogers Disease, Research, Watermelon

Two diseases have been observed in North Florida watermelon. Bob Hochmuth, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Regional Specialized Extension agent in Live Oak, Florida, reported in his weekly email that Psudomonas (angular leaf spot) and gummy stem blight have been reported, though in isolated fields. “If bacterial diseases are not a concern in your fields, …

Gummy Stem Blight Disease: Be Proactive, Not Reactive

Jim Rogers Disease, Research

By Clint Thompson The best defense against gummy stem blight disease is a good offense. Protectant fungicides are available for Alabama’s watermelon producers to guard against it, but growers need to be proactive in applying the fungicides and not be reactive, says Ed Sikora, professor and Extension plant pathologist in the Department of Entomology and Plant Pathology at Auburn University. …