稻粒黑粉病(又称稻粒黑穗病、墨黑穗病、腥黑穗病)是水稻上常见的病害之一。一般发病较轻,每穗上的病粒数从1—2粒到3—5粒不等,10粒以上的情况极少见,也有偶尔剧烈暴发的,1953年四川万县大发生,病穗率达55%,病粒率达27%。1978年我区大发生,其为害程度是罕见的。特别是杂交稻制种田病害更为严重,个别地方造成毁灭性灾害。为了摸清稻粒黑粉病的发生情 Rice powdery mildew (also known as rice smut, ink smut, fish head smut) is one of the common diseases on rice. The general incidence of mild, the number of sick grains per panicle 1-2 grains ranging from 3-5, 10 or more rare cases, but also occasionally violent outbreaks, 1953 Sichuan Wanxian large, disease panicle Rate of 55%, the rate of 27% disease particles. My district occurred in 1978, its degree of harm is rare. Especially the hybrid rice farming diseases are more serious, causing devastating disasters in some places. In order to find out the occurrence of rice powdery mildew