Xanthomonas spp., Pseudomonas syringae
Common bacterial disease causing spots on leaves of peppers, tomatoes, and other crops. Reduces yield and fruit quality.
Small, water-soaked spots that turn brown with yellow halos. Spots may merge into larger lesions. Leaf drop. Raised, scabby spots on fruit.
Bacterial pathogens that enter through stomata and wounds. Survive on seed and plant debris.
Splashing water, contaminated seed, handling wet plants, wind-driven rain. Spreads rapidly in warm, wet conditions.
Warm temperatures (75-86°F). Frequent rain or overhead irrigation. High humidity. Wounds from insects or hail.
Use disease-free seed and transplants. Rotate crops 2-3 years. Avoid overhead irrigation. Space plants for air circulation. Control insects.