水稻白叶枯,是世界性的重要病害,在我国华东、华中和华南稻区有所发生,是国内植物检疫对象。水稻受害后,叶片干枯、瘪粒增多、米质松脆,千粒重降低,一般减产20%～30%,严重者可达50%～60%,甚至颗粒无收。该病主要是可以通过种子远距离传播,病原菌通过风雨和昆 Rice leaf blight, is a worldwide important disease, which occurred in the east, central and southern China rice areas, is the object of domestic phytosanitary. After the damage of rice, the leaves are withered, the shrunken grains are increased, the rice is crisp and the grain weight is reduced. Generally, the yield is reduced by 20% to 30% and the severeness is up to 50% to 60%. The disease is mainly spread through the seeds long-distance, the pathogen through the wind and rain and Kun