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花椰菜上发生的病害主要有黑腐病、病毒病、霜霉病、软腐病,造成生产上的减产。现将几种主要病害的识别方法及防治技术介绍如下: 一、黑腐病 1、症状及危害特点:该病的典型症状是真叶叶缘出现由小到大的“V”字形病斑。受害幼苗子叶呈水渍状。后迅速枯死或蔓延至真叶,流行时,叶缘多处受侵
The diseases that occur on cauliflower mainly include black rot disease, virus disease, downy mildew and soft rot disease, resulting in the reduction of production. Now several major disease identification methods and prevention and treatment techniques are as follows: First, the black rot 1, the symptoms and the characteristics of the disease: The typical symptoms of the disease is true leaf margin appears from small to large “V” -shaped disease spot. Victims of seedling cotyledons were water-like shape. After rapid death or spread to the real leaves, popular, leaf margin invaded