Soybean frogeye leaf spot
scouted Aug. 11, 2022
- Scientific Name
- Cercospora sojina
- Background
- Soybeans in Stokes county, variety MS5398RXT, were scouted and observed 20% of the field was affected by browning and yellowing both marginal and between the veins, ring spot, shot hole,and frogeye in patches in the field. The soybean had curling leaves. Some bean leaf rollers present, stink bugs, kudzu bugs, grasshoppers present. One to three stink bugs per plant and two to four kudzu bugs per plant. Some frogeye present throughout field, yellowing seems to be worse in compacted area. Yellowing is more pronounced on newer, upper leaves in bad areas and seen on older, lower leaves in good areas. Some chewing, feeding present on leaves, grasshopper pressure quite heavy throughout field.
- 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
- Resources
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- No resources have been added.
