小麦纹枯病是危害小麦的主要病害之一。它在田间发生发展可分为冬前发生期、越冬静止期、返青上升期、拔节盛发期和抽穗后白穗显症期5个阶段。在防治上一般都只重视返青上升期以后的几个时期。而对前期的防治往往不加重视,后期错过防治适期,秋季苗期防治少,春季防治迟,已成为防效差的一个重要因素。在南方麦区,小麦一般在10月上中旬播种,晚茬小麦在10月中下旬播种,小麦出苗后病菌即侵染幼苗,形成侵染高峰,但危害不甚明显,生产上多被忽视。在下年春季小麦返青生长期,病菌逐步侵染繁殖,生产上普遍的 Wheat sheath blight is one of the major diseases that endanger wheat. It occurs in the field of development can be divided into winter pre-winter period, rejuvenation, rejuvenation, sprouting Sheng Sheng and heading stage after heading five stages. In the prevention and control generally only pay attention to return to green after the rise of several periods. However, the prevention and treatment of the previous period often neglected the importance of prevention and control of the latter part of the period, less seedling prevention and control in spring, late spring has become an important factor in poor control effect. In the southern wheat area, wheat is generally sowed in mid-October and late-cropped wheat is planted in late-mid-October. After the emergence of wheat, the pathogen infects the seedlings and forms the peak of infection, but the damage is not obvious and the production is neglected. In the next spring wheat turning green growth period, the bacteria gradually infected breeding, production is common