水稻纹枯病是我国水稻主要病害,产量损失一般为15%～20%,重病田可达60%～70%[1]。历史上该病在南方稻区较重,近年来由于气候、品种及栽培等因素的变化,东北稻区纹枯病的发生危害加重。目前,有关水稻纹枯病病原学、抗性评价和综合防治等领域研究较多,而流行学研究仅集中于侵染速率、 Rice sheath blight is a major rice disease in China, yield loss is generally 15% to 20%, severe disease up to 60% to 70% [1]. Historically, the disease is heavier in the southern rice area. In recent years, the occurrence of sheath blight in the northeast rice area has been aggravated by changes in climate, variety and cultivation. At present, there are many researches in the fields of etiology, resistance evaluation and integrated control of rice sheath blight, while epidemiological studies only focus on the rate of infection,