Cercospora leaf spot
scouted Aug. 17, 2023
- Scientific Name
- Cercospora kikuchii
- Background
- Soybeans in Forsyth county, variety AG54XFO, were scouted and it was observed that 10% of field was affected by marginal and between the veins yellowing, and speckling and stippling. The field was sprayed with fungicide. There was small patches of yellowing leaves in the very bottom of the canopy. Only the lower leaves are affected by the yellowing and the brown spotting. The brown spots that have been found in the leaves do not seem to coalesce; they are independent of each other. Some insect damage is present. There is a very large population of Japanese beetles in the field. The site is low, wet, and sunny.
- 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 significant yield losses in North Carolina. Chemical management and cultural practices are both options to control Cercospora leaf blight.
- Resources
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- No resources have been added.
