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通过对越冬病残株及菌核进行分离，埋管分离监测田间菌丝活动，挂牌调查地膜稻及水田各栽培方式的病害流行，结合历年气象资料进行分析，确定在吉林省，水稻纹枯病的初侵染源主要是越冬浮游菌核，其次是病残株，病草；在旱地主要是菌核与病残株．旬平均气温达１８℃以上，相对湿度达７０％以上，即可形成初侵染并发病。此期亦利于水平扩展，重复侵染主要是菌丝，也有当年形成的菌核．旬平均气温在２１℃以上，相对湿度达８０％以上，利于垂直扩展，重复侵染靠菌丝。菌核没有明显的休眠期，它既可以越冬，又可以作为当年重复侵染源。
Through the separation of overwintering diseased strains and sclerotiums, monitoring the mycelium activities in the field by tube-tube separation, and listing the disease epidemics of the cultivation methods of mulched rice and paddy fields, combining with the meteorological data of the past years, it was determined that rice sheath blight The primary sources of primary infection were the overwintering planktonic nuclei, followed by diseased plants and sick grasses; in the drylands, mainly sclerotia and diseased plants. Ten-day average temperature of 18 ℃ or more, the relative humidity of 70% or more, you can form a primary infection and the incidence. This period is also conducive to horizontal expansion, repeated infection is mainly mycelium, but also the formation of sclerotia. Ten days the average temperature above 21 ℃, relative humidity of 80% or more, conducive to the vertical expansion, repeat the infection by mycelium. Sclerotinia no obvious dormant period, it can both wintering, but also as the source of repeated infections.