水稻纹枯病,过去在我省很长一段时间没有被人们重视。到80年代末期,由于高产栽培技术和管理方式的改变等原因,其蔓延速度较快,发生面积较大,危害日趋严重,经济损失较大。纹枯病属担子菌,无性阶段为丝核菌。因此病菌以菌核在土壤中越冬。当日平均气温达22～28℃、 Rice sheath blight, the past in our province for a long time without being valued. By the late 1980s, due to reasons such as high-yielding cultivation techniques and management changes, the spread rate was relatively rapid, the area was relatively large, the harm was becoming increasingly serious, and the economic losses were large. Rhizoctonia is a basidiomycete, asexual stage for Rhizoctonia. So bacteria to sclerotinia wintering in the soil. The average temperature of the day reached 22 ~ 28 ℃,