白斑病是秋白菜的重要病害之一，它常与霜霉病同时发生，引起叶片早期枯死，直接影响了秋白菜的产量和品质。１主要症状及发病条件１．１主要症状 此病菌主要为害叶片，发病初期叶片散生灰白色圆形病斑，后扩大成浅灰色圆形或近圆形病斑，病斑周缘有浓绿色的晕圈，发病重时病斑 White spot disease is one of the important diseases of autumn cabbage, which often occurs with downy mildew at the same time, causing early withered leaves and directly affecting the yield and quality of autumn cabbage. 1 The main symptoms and the incidence of disease 1.1 The main symptoms of the pathogen mainly damage leaves, the incidence of early leaves scattered gray white lesions, enlarged into a light gray round or nearly circular lesions, lesions around the dark green halo Circle, the incidence of severe lesions