穗颈稻瘟是稻瘟病发展的最终表现,其流行受多因子作用:穗期雨季高峰,氮肥过量和剑叶出现叶枕瘟。剑叶叶枕瘟的出现是穗颈稻瘟流行的一个预兆,但能否发展成穗颈稻瘟病,又受穗期雨日,叶片氮素浓度的影响,据观察早季稻田四优“二号”、“三号”剑叶叶枕瘟在破口抽穗期遇雨5—6天, Panicle blast is the final manifestation of the development of blast, and its prevalence is affected by many factors: the peak of the rainy season, the excessive amount of nitrogen fertilizer and the emergence of the leaf pillow blast in the flag leaves. Occipital leaf pillow disease is the occurrence of panicle neck blast epidemic a sign, but can develop into panicle blast, but also affected by the rainy day panicle, leaf nitrogen concentration, it was observed early rice four excellent “two No. ”,“ No. 3 ”Jiye leaf pillow plague in the breaking Heading 5-6 days when the rain,