小麦纹枯病近年来发病严重,据1995年普查,病株率旱田为15～30％,水浇田为71～90％,感病指数(基部1～3节)达31.5～62.5,严重影响了小麦产量。如何进行经济有效的防治,已成为小麦生产上亟待解决的问题。 一、发病因素:①感病品种。小麦品种对纹枯病无免疫类型,但品种之间存在着抗性强弱的差异,大面积多为感病品种。②播种期。播种过早,麦苗生长过旺,发病早。感病率高。适当晚播,冬前麦苗生长健壮,发病晚,感病率低。③温湿度。小麦 Wheat sheath blight is severely morbid in recent years. According to the 1995 census, the rate of diseased plants is 15-30% on dry land, 71-90% on irrigated fields, and the susceptibility index (base 1-3) reaches 31.5-62.5, which seriously affects Wheat production. How to carry out economic and effective prevention and control has become an urgent problem to be solved in wheat production. First, the incidence of factors: ① susceptible varieties. Wheat cultivars were not immune to sheath blight, but there were differences in resistance between cultivars. Most of them were susceptible cultivars. ② sowing period. Early sowing, wheat seedlings over-growth, early onset. High prevalence. Properly late sowing, robust growth of wheat seedlings before winter, the incidence of late, a low prevalence. ③ temperature and humidity. wheat