稻瘟病是由子囊菌Magnaprthe grisea(Hebert)Barr(无性世代为Pyricularia grisea(Cooke)Sacc.)引起的真菌性病害。稻瘟病的发生具有突发性、流行性和毁灭性,影响水稻产量和米质,给水稻生产造成严重损失。稻瘟病是水稻主要病害之一,全国各水稻产区都有发生,尤以山区、丘陵地区发生重,只要条件适宜,容易流行成灾,流行年份一般减产10%~20%,重的减产40%~50%,甚至颗粒无收。 Blast is a fungal disease caused by the ascomycetes Magnaprthe grisea (Hebert) Barr (asexual generation Pyricularia grisea (Cooke) Sacc.). The occurrence of blast is sudden, epidemic and devastating, affecting the yield and quality of rice and causing serious losses to rice production. Rice blast is one of the main diseases of rice. Rice occurs in all rice producing areas in the country, especially in mountainous areas and hilly areas. As long as the conditions are right, the epidemic will easily become epidemic. The prevailing years will generally reduce production by 10% to 20% and the heavy output will decrease by 40% % ~ 50%, or even no crop particles.