水稻纹枯病是水稻主要病害之一,并且近年来的发病情况有所增加。水稻一旦有了纹枯病,轻者影响稻谷灌浆,重者造成植株枯萎倒伏,不抽穗,不结实。发病稻田一般减产10%左右,严重的减产50%以上。水稻纹枯病对水稻安全生产构成很大的威胁,因此,加强水稻纹枯病的研究,采取切实可行的防治对策,对于确保水稻安全生产具有重要作用。1.发病原因。纹枯病的发生和危害,依调查受栽培地菌源数量、气候条件、肥水管理、品种抗病性及群体生长发育 Rice sheath blight is one of the main diseases of rice, and the incidence in recent years has increased. Once rice sheath blight, light affect rice grain filling, severe withering lodging plants, not heading, not strong. The incidence of paddy fields generally cut about 10%, a serious cut of more than 50%. Rice sheath blight poses a great threat to the safe production of rice. Therefore, strengthening the research on rice sheath blight and adopting practical control measures play an important role in ensuring the safe production of rice. 1. The cause of the disease. Occurrence and endangerment of sheath blight, according to the survey by the number of cultivated bacteria, climate conditions, fertilizer and water management, disease resistance and population growth and development