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Disease Control

Texas A&M Finds Southwestern Cotton Rust Disease In West Texas

cotton rust

The Texas A&M AgriLife Extension Service has found southwestern cotton rust disease in fields in western and southern Gaines County and along the county line between Cochran and Hockley counties. AgriLife Extension specialists say the severity of the disease is still low, and fungicide application is not yet necessary – but producers should be aware of the symptoms. Southwestern cotton ... Read More »

Cotton Blue Disease Discovered In Central Texas

cotton blue disease

A new viral disease of cotton found in recent years in several southeastern U.S. states has now been confirmed in Texas. The disease, cotton blue disease, was observed recently in a cotton field in Central Texas where multiple off-type plants were noted by a research group headed by Dr. David Stelly, a cotton breeder in the Department of Soil and ... Read More »

Cotton Cercospora Leaf Spot Observed Across North Carolina

cercospora leaf spot

• By Lindsey Thiessen • Cercospora leaf spot of cotton (Fig. 1), caused Cercospora gossypina (syn. Mycosphaerella gossypina), has been observed across North Carolina cotton growing regions. Foliar symptoms include reddish lesions that enlarge to have white to light brown centers. These symptoms may also be similar to other foliar diseases, like Stemphylium leaf spot or Alternaria leaf spot. Symptoms ... Read More »

Plant Disease Detection Using Smartphone Goes High Tech

smartphone disease detection

North Carolina State University researchers have developed a handheld device that can be plugged into a smartphone to help farmers identify plant diseases in the field. “All plants release VOCs (volatile organic compounds) as they ‘breathe,’ but the type and concentration of those VOCs changes when a plant is diseased,” says Qingshan Wei, an assistant professor of chemical and biomolecular ... Read More »

Cotton Leafroll Dwarf Virus Present In Alabama; Scouting Essential

cotton leaf roll virus

Extension professionals have already confirmed the presence of cotton leafroll dwarf virus (CLRDV)—the causal agent of cotton blue disease — on multiple research substations across Alabama. The aphid-transmitted disease has been monitored closely since it appeared in cotton fields during fall 2017. Kassie Conner, an Alabama Extension plant pathologist, said the virus was confirmed in samples taken since July 1. ... Read More »

Know Your Fungicide Options And When To Use Them

target spot in cotton

• By Heather Marie Kelly • Cotton is blooming in Tennessee, and I’ve gotten some calls asking about fungicides – there are options but none is warranted at this time. As the rain, heat and humidity continue, we may start to see target spot develop, which could justify a fungicide application. Only since 2013, when target spot in cotton was ... Read More »