Bacterial blight of kidney bean can infect both seedling stage and adult stage, which can harm leaves, stems, vines, pods and seeds, especially leaves. At seedling stage, infected cotyledons produced reddish-brown ulcer spots, and young stems produced reddish-brown oil-soaked spots. After a week around the stem, the seedlings are easy to break and die. In the adult stage, the damaged leaves, leaf tips and leaf edges are dark green oil spots at first, like boiling water, and then expand into irregular grayish brown patches, with yellow-green halo around the diseased spots, which are organized and translucent in the middle and fragile after drying. In severe cases, the diseased spots are connected, covering the whole leaf, like fire, which makes the whole leaf curl and die, but it is not easy to fall off. When wet, the leaves rot and turn black, light yellow mucus pus is secreted on the diseased spot, and the tender leaves are twisted and deformed. The diseased spot on the stem is a long reddish-brown ulcer with a slight depression in the center. After a week around the stem, the upper stem and leaf wilted and died. The diseased spots on the pods are mostly irregular or slightly round, reddish brown to brown, and in severe cases, the pods shrink. The infected seeds shrink, producing black pits, and the navel overflows with yellowish mucus pus. ?