Cercospora Leaf Spot
Cercospora spp.
Fungus
Leaves
Overview
A widespread fungal disease affecting many crops, causing circular to angular spots with gray to tan centers and reddish-brown to purple borders on leaves.
Symptoms
Circular to angular leaf spots with gray to tan centers and dark reddish-brown or purple borders. Spots may coalesce into large necrotic areas. Premature defoliation reduces yield and quality.
Environmental Conditions
Humid
Prevention
Rotate crops. Use resistant varieties. Ensure adequate spacing. Avoid overhead irrigation. Remove crop debris after harvest.
Management
Apply copper or chlorothalonil fungicides. Remove severely infected leaves. Improve air circulation. Avoid working with wet plants.