菌核病为紫菜薹的重要病害,主要在南方老菜区露地和北方保护地内发生分布。通常病株零星,对生产造成轻度影响,严重时常造成幼苗成片死亡。一、症状识别主要发生在采种株上,多发生在终花期后,危害叶、茎及荚,但以茎部受害最重。一般多从植株近地面的衰老叶片边缘或叶柄开始发病,初呈水浸状浅褐色病斑,在多雨、高湿条件下,病斑上可长出白色绵毛状的菌丝,并从叶柄向茎部蔓延,引起茎部发病。茎部病斑亦先呈水浸状,后微凹陷,由浅褐色转变为白色。高湿条件下,茎部 Sclerotinia is an important disease of seaweed sprouts, mainly distributed in the old vegetable area in the south and protected areas in the north. Sporadic strains are usually sporadic, causing a slight impact on production, often causing severe seedling deaths. First, the symptom recognition occurs mainly in the seed collection, occurred in the final flowering stage, endangering leaves, stems and pods, but the hardest hit the stem. Generally from the plant near the ground edge of the aging leaves or petiole onset, the initial showed a light brown watery spots, in rainy, high humidity conditions, the lesion can grow white cottony mycelium, and from the petiole Spread to the stem, causing the stem disease. Stem lesions were also first flooded, after the micro-depression, from light brown to white. High humidity conditions, stems