稻曲病，近年来由于水稻品种的更新、施肥水平的提高及气候条件的变化，发生逐年加重，已成为水稻穗期的主要病害之一。１９９９年我县发生面积达２００００ｈｍ２以上，重发田块减产达１０％以上。 一、发病症状 该病害仅在水稻穗部发生。病菌侵入谷粒后，破坏谷粒内部组织， In recent years, rice false smut has been increasing year by year due to the update of rice varieties, the improvement of fertilization levels and the change of climatic conditions, and has become one of the major diseases at the heading stage of rice. In 1999, the county occurred in an area of ​​20000hm2 or more, heavy field plots reduced production of more than 10%. First, the disease symptoms of the disease occurred only in the ears of rice. Germs invade the grain, the destruction of grain internal organization,