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一、症状属真菌性病害，主要危害叶片和叶柄，花梗及种荚均可受害。叶片受害多从外叶或下叶开始，初为灰褐色或灰白色圆形病斑，后病斑扩大，表面密生黑色丝状霉。茎和叶柄受害，病斑呈纵条状，上面生黑色霉状物。花粳和种荚受害，病斑与霜霉病病斑形状相似，所不同的是黑斑病
First, the symptoms are fungal diseases, the main hazards leaves and petioles, pedicels and pods can suffer. Leaf damage more from the outer leaf or lower leaf began, the beginning of a gray-brown or gray-white lesions, enlarged lesion, the surface dense black filamentous mold. Stems and petiole victims, spots were longitudinal stripes, the above black moldy material. Flower Japonica and seed pod damage, lesion and downy mildew spot similar shape, the difference is black spot disease