Bacterial Leaf Spot
Xanthomonas campestris, Pseudomonas syringae
Bacteria
Leaves
Fruit
Overview
A group of bacterial diseases causing water-soaked spots on leaves that may become necrotic. Common on peppers, tomatoes, and many ornamental plants.
Symptoms
Small, water-soaked spots on leaves that enlarge and become brown or black with yellow halos. Spots may coalesce into large necrotic areas. Premature defoliation. Fruit spots on peppers and tomatoes.
Environmental Conditions
Humid
Prevention
Use disease-free seed and transplants. Rotate crops. Avoid overhead irrigation. Ensure good air circulation. Copper sprays as preventive measure.
Management
Apply copper-based bactericides. Remove infected leaves. Avoid working with wet plants. Improve air circulation. No cure once systemically infected.