近几年来,晚疫病在蕃茄上大发生,有的地块几乎无收。开花结果期得病多,苗期也有不少植株感伤。大部分在离地面的茎上发生。初期为水浸状,以后形成病斑。病斑逐渐扩大,呈黑褐色腐败状,严重时能引起植株萎蔫。需及早防治。 In recent years, late blight occurred on tomatoes, and some plots are almost no income. Flowering period of the disease is more, there are many plant seedling sentimental. Most occur on the stem of the ground. The initial state of flooding, after the formation of spots. Lesions gradually expanded, was dark brown corrupt, can cause serious plant wilting. Need to prevent and cure as soon as possible.