油菜菌核病从苗期到成熟都常发生,但以终花期至接近成熟期发病较重,此病菌为害油菜的叶和叶柄、茎秆、花和荚,但以茎秆发病最重。其病斑初呈水渍状,后呈园形或不规则形斑块,病斑处可见绵毛状菌丝,染病植株,其叶片、茎秆、花瓣常易腐烂,病荚往往提早枯死,导致种子瘦秕而严重减产。 Sclerotinia sclerotiorum often occurs from seedling stage to maturity, but it is more serious from the final flowering stage to near mature stage. The pathogen affects the rape leaves and petioles, stalks, flowers and pods, but the most serious is the incidence of stalk. The lesion initially showed water stains, followed by a round or irregular shaped plaques, lesions can be seen at the mycelium, infected plants, leaves, stems, petals often perishable, sick pods tend to die early, Lead to seed slender and severely cut production.