Soybean frogeye leaf spot

scouted Sept. 15, 2021

Scientific Name
Cercospora sojina
Background
Soybeans in Greene county were scouted and observed 55% of the field was affected by widespread browning and yellowing, leaf spots, root rot, and wilting in random patches. The site is low area.
Conclusion
The issue was identified as Frogeye leaf spot which is a common foliar disease in North Carolina. The causal agent is Cercospora sojina. Early symptoms are small, dark, water-soaked circular to angular lesions, which expand as the disease progresses and become brown to grayish with a brown-reddish border. Lesions can also occur on the stems and the pods. Management practices include crop rotation with non-host crops like corn or wheat, host resistance, and fungicide use may be beneficial when susceptible hosts are planted and there’s disease pressure
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