稻曲病是湖南水稻常发病之一。七十年代中、后期以来,全省连年发生。一般晚稻重于早稻,杂交稻重于常规稻,迟熟种重于早熟种,山区重于丘陵平原。一、危害严重性1977年井岗山南麓高寒山区的桂东县,种植十万零三千七百亩杂交中稻,发生稻曲病的占总面积34.9%,城郊公社的草堂、茅柳、琴山三个百亩丰产片,几乎丘丘都有发生,一般病穗率为3—5%,部分丘块为10—20%,个别丘块达50.0%以上。1979年全省普遍发生,1982年发生更为严重,部分地区 False smut is one of the most common diseases in Hunan rice. Seventies, since the late, the province occurred year after year. Common late rice is heavier than early rice, hybrid rice is heavier than conventional rice, late maturity is heavier than early maturity, mountain heavier than hilly plain. I. Hazard Severity In 1977, in Guidong County, in the alpine mountainous area at the south foot of the Jinggangshan Mountains, 103,700 mu of hybrid midsize rice was planted and 34.8% of which was smut-proofed. In the outskirts commune, Qingshan three hundred acres of high yield film, almost Qiuqiu have occurred, the general encephalon rate of 3-5%, part of the hill for 10-20%, individual hill blocks up to 50.0%. In 1979 the province occurred generally, occurred even more serious in 1982, in some areas