纹枯病是水稻的主要病害之一,80年代以来,随着矮秆高产品种的推广,单产要求的提高,化肥的单一施用,纹枯病危害面积逐年增加,减产程度日益加重。成为高产田、丰产片增产的主要障碍。我局种植水稻15000亩左右,每年都有70～80％的面积发生纹枯病,百蔸发病率在40％以上的面积约占总面积的15～20％。轻者影响稻谷灌浆、空壳率增加、千粒重降低,重者病斑上顶、抽穗困难、结实粒极少,造成大幅度减产。 Sheath blight is one of the main diseases of rice. Since the 1980s, with the popularization of high-yielding dwarf varieties, the increase of yield requirements, the single application of chemical fertilizers, the area of ​​sheath blight damage increased year by year, and the degree of yield reduction has been aggravating. A high yield field, yield a major obstacle to yield. I plant about 15,000 acres of paddy rice, annual occurrence of 70 to 80% of the area of ​​sheath blight, the incidence of more than 40% of the area accounts for about 15 to 20% of the total area. Light affect rice grain filling, empty shell rate increased, reduced 1000-grain weight, severe lesions on the top, heading difficulties, very few grains, resulting in a substantial cut.