主要症状:黑腐病除危害紫菜薹之外,还危害大白菜、小白菜等白菜类蔬菜。以叶片发病为主,幼苗出土前染病不出苗,出土后染病子叶呈水浸状,根髓部变黑,幼苗枯死。成株染病,引起叶斑或黑脉,叶斑多从叶缘向 The main symptoms: black rot addition to the dangers of seaweed sprouts, but also endanger cabbage, cabbage and other cabbage vegetables. The main leaf disease, young seedlings before emergence of disease does not emerge, cotyledon diseased leaves after flooding-like, root marrow black, seedlings dead. Adult disease, causing leaf spots or black veins, leaves more leaf edge from