症状主要发生在叶片上，严重时亦危害叶柄、茎和豆荚。发病初期，叶背产生淡黄色的小斑点，后变褐色，隆起呈小脓疱病斑。后逐渐扩大呈现红褐色夏孢子堆，表皮破裂散出红褐色粉末（夏孢子）。这时从叶正面观察则形成褪绿斑点。后期在叶柄、茎蔓、豆荚及叶片上长出黑褐色锈病斑 Symptoms mainly occur on the leaves, but also in severe cases petioles, stems and pods. Early onset, the back of the leaves produce a small yellowish spots, after turning brown, swelling was a small pustular lesion. After the gradual expansion of the reddish brown summer spore reactor, rupture of the skin scattered red brown powder (Uospora). At this time from the front of the leaves are observed formation of chlorotic spots. Later in the petiole, stem vine, pods and leaves grow dark brown rust spots