小麦叶枯病是由多种病原物侵染所致，随着栽培管理条件的变化及小麦品种的频频更换，该病在我县麦区为害日趋严重，一般麦田病情指数９．４７％～１８．３２％，减产３％～１０％，重者达２５％以上，严重影响了小麦的产量和质量，为摸清小麦叶枯病发生规律，寻求有效的化学防 Wheat leaf blight is caused by a variety of pathogen infection. With the change of cultivation and management conditions and frequent replacement of wheat varieties, the disease is more and more serious in our county wheat area. The general wheat field disease index is 9.47% ~ 18 .32% of the total output, 3% -10% of the decrease, and more than 25% of the heavy losses, seriously affecting the yield and quality of wheat. In order to find out the law of the occurrence of wheat leaf blight and seek effective chemical defense