近年来,小麦根腐病、纹枯病等小麦土传病害发生呈上升趋势,给小麦产量带来很大影响。在生产中,部分农民重治轻防、抓不住防治关键时期,也是造成小麦产量降低的原因之一。一、病害症状1、纹枯病。发病初期,在近地表的叶鞘上产生周围褐色、中央淡褐至白色棱型病斑,重病株茎基1—2节变黑甚至腐烂,常早期死亡。生长中 In recent years, wheat root rot, sheath blight and other wheat soil-borne diseases are on the rise, bringing a great impact on wheat yield. In the course of production, some peasants are relying on light defenses and failing to grasp the key period for prevention and control, which is also one of the reasons for the decrease of wheat output. First, the symptoms of disease 1, sheath blight. Early onset, in the surface of the sheath around the brown, central light brown to white edge-type lesions, severe disease stem base 1-2 black or decay, often early death. Growing