Common bacterial blight

Xanthomonas axonopodis pv. phaseoli

Common bacterial blight affects the foliage and pods of the common bean and soybean. Symptoms initially appear as small, water-soaked spots (lesions) on the leaves. The lesions gradually enlarge and coalesce into irregular shapes, frequently one inch or more in diameter, and they exhibit a scalded appearance. The lesions may become dry and brown and surrounded by a narrow, lemon-yellow-colored margin. The lesions frequently occur along leaf margins. Infected pods may exhibit circular, slightly sunken, water-soaked areas. In humid conditions, infected areas on the pods may produce yellow masses of bacterial ooze. The infected areas on the pods usually dry to become reddish-brown lesions, and pod infections frequently result in discolored and shriveled seeds.

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