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Bacterial
Blight is caused by Pseudomonas syringae pv glycinea. New
lesions of bacterial blight are small, angular, yellow to brown spots on leaves.
The centers soon dry out, turn reddish brown to black, and are surrounded by a
water-soaked margin bordered by a yellowish green halo, a feature that is
lacking in brown spot. Young leaves are most susceptible to the bacterial
infection, therefore, the disease is first noticeable on the top of the plant.
The angular lesions enlarge in cool (70-80° F), rainy weather and merge to
produce large, irregular lesions. The centers of old lesions often drop out,
resulting in a ragged appearance of infected leaves. The bacteria also can
infect stems, petioles, and pods.
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