大白菜软腐病和黑腐病为细菌性病害。重发地块损失率达20～30%,已成为大白菜生产的重要障碍。症状识别软腐病:多在包心期开始发病,菜株外叶萎蔫,平贴地面,叶球外露,叶柄基部及根髓部腐烂,充满灰褐色粘稠状物,臭气四溢。 Chinese cabbage soft rot and black rot are bacterial diseases. Mass loss rate of re-issued land 20 to 30%, has become an important obstacle to the production of Chinese cabbage. Symptoms of identifying soft rot: more in the beginning of the onset of the package period, vegetable plants outside the wilting, flat paste the ground, exposed leaves, petioles and roots of the roots of decay, filled with grayish brown sticky, odor overflowing.