一、萎蔫病:(也叫枯萎病)正个生长期都能发病,但是以苗期最重。苗期幼茎凋萎而死,但叶上无病斑,接近地面外的茎基部多细缩。成株期被害,茎顶端开始萎蔫下垂,呈现黄绿色,最后全株干枯死亡,这时虽然茎仍直立不倒伏,但是植株根部却全遭破坏,因而病株极易从土中拔出。在潮湿天气中,茎基部多出现粉红色霉状物。二、炭疽病:苗期至成熟期正个生育期间植株各个部分都能被害。苗期被害,幼苗常 First, wilting: (also known as blight) can be a growing period of disease, but to seedling heaviest. Seedling wilt withered and died, but no disease spots on the leaves, close to the ground outside the stem base more fine. The plants were killed at the plant stage. The tops of the stems began to wilt and wilted, showing a yellow-green color. Finally, the whole plant died of dryness. At this time, although the stems were still upright and lopsided, the roots of the plants were completely destroyed and the diseased plants were easily pulled out of the soil. In damp weather, pink mildew appears more on the base of the stem. Second, anthrax: seedling to maturity is a period of growth during all parts of the plant can be victimized. Seedling victims, seedlings often