水稻纹枯病是沿淮地区常见的一种水稻病害，近年来逐渐加重，发生面积达80％以上，严重影响水稻生长。它主要通过破坏稻株组织和茎叶的光合作用，削弱根部的吸收能力，降低营养物质的积累，造成灌浆不足，空机率增加，严重时甚至不能抽穗。一般减产10％～20％，严重时减产达40? Rice sheath blight is a common rice disease along the Huaihe area, which has been gradually aggravating in recent years. The occurrence of rice sheath blight is more than 80%, seriously affecting the rice growth. It mainly through the destruction of rice plant tissue and stems and leaves of photosynthesis, weakened the absorption capacity of the roots, reduce the accumulation of nutrients, resulting in insufficient filling, empty chance increase, even in severe cases can not be heading. General cut 10% ~ 20%, severe cut when the production of 40?