Frogeye leaf spot

Area of impact: Leaves

Description: Small, round brown or gray lesions on leaves with dark violet or reddish margins.

Pathogen involved: Cercospora sojina (a fungus)

Timing/Conditions: Occurs all season in humid wet warm weather.

Contributing factors: Frogeye leaf spot is a common problem in the South. Young leaves are most likely to be infected. Overwinters in soybean residue and seeds.

Management practices: Plant resistant varieties and pathogen-free seeds, rotate with a non-bean crop, use seed treatments, bury infested residue and use foliar fungicides.

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