病原物为半知菌亚门真菌多主枝孢(草本枝孢)和大孢枝孢。多主枝孢Cladosporium
herbarnm Link et Fr.,菌分生孢子梗直立,褐色或榄褐色,单枝或稍分枝,上部稍弯曲,顶生分生孢子呈短链状,椭圆形,具1~3个隔膜。大孢枝孢菌Cladosporrum
macrocarpum Preuss,菌丝铺展状,分生孢子梗褐色,簇生或单枝,微弯曲,分生孢子椭圆形,具2个或多个隔膜,淡褐色。
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