By Navjot Kaur and Bhabesh Dutta Watermelon anthracnose is caused by the fungal pathogen Colletotrichum orbiculare, which impacts all above-ground parts of the plant. C. orbiculare also causes anthracnose in other cucurbit crops such as cucumber, muskmelon, squash, gourd, pumpkin, cantaloupe and honeydew. The disease is favored by conditions including high humidity, rainfall, overhead irrigation and warm temperatures in the …
Powdery Mildew: What Cucurbit Growers Need to Know
By Clint Thompson Powdery mildew is a disease all cucurbit farmers need to be familiar with this spring season. Unlike other pathogens that need wet, rainy conditions to flourish, powdery mildew prefers a drier environment. If weather conditions turn dry this spring, powdery mildew could be most concerning, says Ed Sikora, professor and Extension plant pathologist in the Department of …
Improving Pre-emergent Herbicide Use in Vegetable Row Middles
By Ramdas Kanissery, Ruby Tiwari and Nirmal Timilsina Weeds are problematic in vegetable production as they compete with crops for nutrients, water and other resources. Weeds that emerge in the spaces between the raised beds (row middles) not only serve as hosts for pests and diseases but can potentially interfere with farm operations (Figure 1). Weeds can negatively affect field …
Fungicides to Manage Cercospora Leaf Spot on Beets
Cercospora leaf spot disease, the most damaging disease on beet greens and bunch beets, can be managed just as equally with either conventional or organic fungicides, according to The South Carolina Grower, Clemson plant pathologist Tony Keinath. Based on previous research in New York with processing beets, Keinath evaluated the best conventional program – Tilt alternated with Quadris – and …
Attention North Florida Watermelon Producers: Diseases Observed in Isolated Fields
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, …
Bacterial Spot: Active but Declining in South Florida
Bacterial spot disease continues to be active on tomato and susceptible pepper varieties across Southwest Florida, according to the South Florida Pest and Disease Hotline. However, overall disease pressure has declined with the recent dry weather in the southern part of the state. The disease continues to be widespread in fields in Homestead, Florida and is starting to become prevalent …
Gummy Stem Blight Disease: Be Proactive, Not Reactive
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. …
Disease Management Vital for Blueberry Producers Following Freeze
By Clint Thompson A dire situation could get worse for blueberry growers impacted by the freeze event during the weekend of March 12. The crop is susceptible to potential disease pathogens that require immediate action, says Jonathan Oliver, University of Georgia (UGA) assistant professor and small fruits pathologist. “The blueberries were at green fruit stage for the highbush. If they …
Management Strategies for Cucurbit Farmers Against Anthracnose
By Clint Thompson The best management strategies for cucurbit farmers in combating anthracnose disease occurs before the crop will be planted this season. Ed Sikora, professor and Extension plant pathologist in the Department of Entomology and Plant Pathology at Auburn University, discusses the importance of using varieties that are resistant to the pathogen. “Fortunately, we do have resistant varieties to …
Little Impact from Neopestalotiopsis Fruit Rot This Season for Florida Strawberry Growers
By Clint Thompson A calm disease year for Florida’s strawberry growers meant fewer instances of Neopestalotiopsis Fruit Rot disease. After the previous couple of seasons, producers welcomed the break, says Natalia Peres, professor of Plant Pathology at the University of Florida/IFAS Gulf Coast Research and Education Center. “It’s been pretty quiet with few exceptions from growers that got plants that …