水稻纹枯病是水稻病害中发生面积最大,发病频率最高,对生产影响最大的病害。据笔者在辽宁省盘锦市盘山县太平农场调查,养蟹稻田水稻纹枯病发病穴数达100％,不仅使水稻减产88～100公斤/亩,而且直接影响稻田养殖业的发展。 纹枯病属于高温、高湿病害,当气温达22℃以上时,相对湿度在90％以上即可发病。在25℃～30℃,温度达饱和时,发病最重。 养蟹稻田,由于水层较深(10～ Rice sheath blight is the disease occurring in paddy diseases with the largest area, the highest frequency of occurrence and the greatest impact on production. According to the investigation by the author at Taiping Farm in Panshan County, Panjin City, Liaoning Province, the incidence of rice sheath blight in crab rice fields reached 100%, which not only reduced the yield of rice by 88-100 kg / mu, but also directly affected the development of paddy field aquaculture. Rhizoctonia is a high temperature, high humidity disease, when the temperature reaches 22 ℃ above, the relative humidity can be more than 90% of the disease. At 25 ℃ ~ 30 ℃, the temperature reached saturation, the incidence of the heaviest. Crab-paddy fields, due to the deeper water layer (10 ~