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软腐病、霜霉病、病毒病号称大白菜生产上的三大病害,对白菜的产量影响很大,病害发生时,轻则减产20%~30%,重则达到50%以上。下面介绍三大病害的防治方法。软腐病俗称“烂疙瘩”。发病初期白菜帮基部形成水浸状微黄色浸润区,逐渐变为黄褐色,呈黏滑软腐状,叶片萎蔫,最后使根茎部腐烂,有恶臭味。一般从莲座期到包心期大发生,该病是由软腐细菌为害引起,温湿度较高时,细菌繁殖快,发生就严重。
Soft rot, downy mildew, virus disease, said cabbage production of the three major diseases on the cabbage production, a great impact on disease occurs, ranging from 20% to 30% reduction, while the weight is more than 50%. The following describes the prevention and treatment of three major diseases. Soft rot known as “rotten pimple ”. Early onset of cabbage to help form the basal part of the infiltration-like yellowish infiltration zone, gradually turned yellowish brown, soft and rotten sticky slippery, leaf wilting, and finally to the root rot, a bad smell. Generally occurs from the rosette period to the great package period, the disease is caused by the damage caused by soft-rot bacteria, high temperature and humidity, the bacteria multiply fast, serious.