农民防治稻瘟病多是在叶瘟盛发高峰期和穗稻瘟危害始盛期进行,致使防治效果不太理想。从稻穗颈瘟的侵染过程来看,穗刚抽出的1～2天,抗病力最弱,70～80%的病菌孢子都在这段时间侵入。病菌侵入穗颈后,并不立即表现出病症,病菌孢子在组织内繁殖,在温、湿度适宜的条件下,一般经过7～ Prevention and treatment of rice blast in peasants are mostly in the peak of leaf blast and earliest stage of panicle blast damage, resulting in less than ideal control effect. From the process of infection of rice neck blast, 1-2 days of freshly picked ear, the weakest disease resistance, 70-80% of the bacteria spores are invading at this time. Bacteria invade panicle neck, does not immediately show the disease, bacteria spores in the tissue reproduction, in the temperature and humidity suitable conditions, generally after 7 ~