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Disease Control

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 »

UGA Cotton Team Studying Potentially Damaging Disease

cotton blue disease

Scientists from the University of Georgia College of Agricultural and Environmental Scientists are investigating the epidemiology of cotton leaf roll dwarf virus (CLRDV) in Georgia using a $75,000 grant jointly funded by the Georgia Cotton Commission and Cotton Incorporated. CLRDV is known to cause cotton blue disease, which can reduce yields up to 80% in cotton fields infected in early ... Read More »

Know How To ID Early Season Stand Loss And Cotton Diseases

stand loss from reniform nematode

• By Thomas Isakeit • Early season stand loss of cotton could be the result of fungal pathogens or, in the case of some fields in the Upper Coast counties (e.g. Wharton and Fort Bend), high populations of reniform nematodes. Seedling death from fungi can vary from season to season and severe impacts are usually associated with cool, wet conditions ... Read More »