1959年我们由四川江津、泸州等地引进了大红瓢虫,一年来在我自治州榕江县,对桔类果树的吹绵蚧壳虫发挥了很大的生物防治威力,使受害率由1958年的75.2％降低到4.3％,枯死率(吹绵蚧壳虫为害所引起)由10—70％压低到根本无一死亡的现象,不但节约了大量防治劳力,还省下了近千元的药费开支。 初步观察大红瓢虫在榕江一般以成虫越冬,一年可繁殖四代。越冬成虫于3月上旬开始活动,4月中 In 1959, we introduced Red Ladybugs from Jiangjin, Luzhou, Sichuan Province, and other places. In Rongjiang County, one of the autonomous prefectures of our country, we played a great biological control power against the cotton fruit insects, From 75.2% to 4.3%. The mortality rate (caused by blowing cotton scale insects) was reduced from 10-70% to no mortality at all, which not only saved a great deal of work on prevention and control, but also saved nearly a thousand yuan of medicine Expenses. Initial observation Red ladybug in Rongjiang general adult wintering, four generations a year. Overwintering adults begin activities in early March, mid-April