Cercospora stem blight

scouted July 31, 2024

Scientific Name
Cercospora kikuchii
Background
Soybeans in Hyde County, variety Asgrow 41XF2, were scouted and observed to be affected by localized root rot in 3% of the field. This area affected is one in which soybeans did not come up or are smaller and yellowish green. The plants in this affected area have little root systems. This area has been an issue in past years as well. Soil and nematode samples were taken and submitted to the PDIC and NCDA for diagnosis.
Conclusion
The issue was identified as Cercospora blight of soybean. This disease is caused by the pathogen Cercospora kikuchii and although it's common in soybeans it rarely causes significtant yield losses in North Carolina. Chemical management and cultural practices are both options to control Cercospora leaf blight.
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