Frogeye Leaf Spot
scouted Sept. 10, 2024
- Background
- Soybeans were scouted at the R6 growth stage and small, circular brown/gray lesions were observed on leaves.
- Conclusion
- This issue was confirmed by the NC State Plant, Disease and Insect Clinic to be Frogeye Leaf Spot (FLS) caused by Cercospora sojina. Symptomology associated with FLS includes small, dark, water soaked, circular to angular lesions. As lesions expand they become brown/gray in color with a yellow halo around leaf spots. Frogeye leaf spot favors warm, humid conditions. FLS is best managed using integrated strategies including crop rotations with non-host crops, planting a resistant variety, and in severe cases a fungicide could protect yield. Fungicide applications are most effective when applied between the R3 and R5 growth stages for FLS.
