近年来,我省水稻稻瘟病发生面积逐年扩大,危害程度逐年加重。1980年发病面积仅77.2万亩,1985年发展到760万亩,其中早稻600万亩,晚稻160万亩,全年损失稻谷4亿斤。稻瘟病近几年如此加剧,原因固然很多,如品种、菌源、栽培管理、施肥水平,气候条件,防治好坏等等。但从各年发病因 In recent years, the area of ​​rice blast in our province has been expanding year by year, with the degree of harm increasing year by year. In 1980, the disease area was only 772,000 mu, reaching 760 million mu in 1985, including 6 million mu of early rice and 160 million mu of late rice, and 400 million kg of rice were lost throughout the year. Rice blast in recent years so aggravated, of course, a lot of reasons, such as varieties, fungi, cultivation and management, fertilization levels, climate conditions, prevention and treatment of good and bad so. However, etiology from the years