Term: Bacterial Spot
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A big fan of (harming) the nightshade family, this bacterial infection commonly shows up on peppers and tomatoes. Small and irregularly-shaped black spots will accumulate on leaf tops and cause yellowing and eventual death of the leaf. Defoliation will result in overall weakness in vigor and fruit production. Warm, wet weather encourages this disease. Prevent with drip irrigation, ample air circulation, and crop rotation when applicable.