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黑腐病是细菌性病害,主要为害十字花科蔬菜。其中,对甘蓝、花椰菜、萝卜的为害最严重,其次是白菜、芥菜、苤蓝等。1 症状识别 在甘蓝、花椰菜上,主要为害叶片,病菌由水孔侵入,多从叶缘发生,再向内延伸呈“V”字形的黄褐色病斑,边缘有黄色晕圈;有时病菌沿叶脉向内扩展,产生黄褐色大斑或者叶脉变黑呈网状,病菌如从伤口侵入,可在叶片的任何部位形成不规则形的黄褐色病斑。剖开球茎可见导管变黑色。天
Black rot is a bacterial disease that harms cruciferous vegetables. Among them, the most serious damage to cabbage, broccoli, radish, followed by cabbage, mustard, blue and so on. 1 Symptoms Identification In cabbage, cauliflower, the main damage leaves, bacteria invaded by the water hole, and more from the leaf margin occurs, and then inwardly extending was “V” -shaped brown spots, the edge of a yellow halo; sometimes bacteria along the veins Inward expansion, resulting in large yellowish brown spots or dark veins reticulate, bacteria invaded from the wound, in any part of the blade to form irregular brown spots. Cut the bulbs visible catheter becomes black. day