黑腐病是河北省三河地区秋季甘蓝蔬菜最常见的病害之一,明显影响甘蓝的产量和品质。发病症状主要危害叶片。病菌主要由水孔侵染,叶缘形成“V”字形病斑,或从伤口侵入叶片形成不定形病斑。病斑淡褐色,边缘有浅黄色晕圈。病部叶脉变黑,病菌沿叶脉发展,通过叶柄发展到短缩茎,致使外部叶片枯黄,严重的整株叶片萎蔫枯死。剖开 Black rot is one of the most common diseases of cabbage in autumn in Sanhe District of Hebei Province, which obviously affects the yield and quality of cabbage. The main symptoms of the disease leaves. Pathogen mainly by the water hole infection, the leaf margin to form “V” -shaped lesion, or invade the leaves from the wound to form an amorphous lesion. Light brown spot, the edge of a light yellow halo. Veins black veins, pathogen development along the veins, development to the shortened stems through the petiole, resulting in the outer leaves of yellow, severe whole plant wilted withered leaves. Cut open