一、疫病该病发生在8~10月,主要为害整个植株,黑褐色的病斑首先出现在植株的基部,呈水渍状。造成根系坏死,引起植株顶枯,叶片变黄脱落、枯萎。严重时病斑连成片,整个植株像被开水烫过一样,随后叶片皱缩、干枯。在防治上,应加强水分管理,控制荫棚内湿度;在梅雨季节要拉开荫棚周围遮阳网,进行通风换气降湿,减少病害发 First, the disease The disease occurred in August to October, the main damage to the entire plant, dark brown spots first appeared in the plant's base, was water-like. Cause root necrosis, causing plant top dead leaves turn yellow off, withered. Serious lesions even into pieces, like the entire plant was boiled water the same, then the leaves shriveled, dry. In the prevention and control, water management should be strengthened to control the humidity within the shade shed; in the rainy season to open the shading shade around the net, ventilation and dehumidification to reduce disease