稻粒黑粉病菌Neovossia horrida(Tak.)在大田生产中除极少数品种外,一般发病轻微。但杂交稻三系制种母本(雄性不育系)和化学杀雄制种母本,一般病粒率20-30％,重者50％左右,甚至80％以上。造成这种现象的原因有以下几条: 1.水稻是自花授粉作物,传粉过程在水稻开花时颖壳张开前后的瞬间即已完成,花粉在湿润的柱头上经2分钟即可萌发,15-30 Rice germ Neovossia horrida (Tak.) In the field of production in addition to a very small number of species, the general incidence of minor. However, the three-line hybrid rice breeding male parent (male sterile line) and chemical kill male seed system, the general disease rate of 20-30%, weight about 50%, or even 80%. The reasons for this phenomenon are the following: 1. Rice is a self-pollination of rice, pollination process in the opening of the rice husk before and after the moment has been completed, the pollen on the wet stigma after 2 minutes germination, 15-30