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小地老虎(Agrotis ypsilon Rott.)是世界性的大害虫。1776年 A.S.Rottemburg,描述了它的形态和为害习性,以后世界各国昆虫学家广泛地对它进行了研究。在长期研究中,发现它既不在亚热带平原地区越夏,又不在温带地区越冬,而且在同一地区有明显的季节性突增突减现象。这一现象,本世纪初印度伍德豪斯(Woodhouse)等及一些欧美昆虫学家提出了小地老虎春季向北、秋季向南远距离迁飞的假说。国内在东部农业区,地老虎中分布最广、发生量最大、危害最重的是小地老虎,很早就受到了重视。吴福祯1926年发表《地老虎之研究》以后,各地进行了大量研究工作。但是,在我国淮河、秦岭一线以北广大
Agrotis ypsilon Rott. Is a worldwide pest. A.S. Rottemburg, 1776, describes its morphology and pest habit, and has since been studied extensively by entomologists from all over the world. In the long-term study, it was found that it neither over-summer in the subtropical plains nor overwintering in temperate regions, but also in the same region there is a clear sudden surge phenomenon. This phenomenon, at the beginning of this century, Woodhouse et al., And some European and American entomologists put forward the hypothesis that the small land tiger migrates to the north in spring and migrates south in autumn. Domestic agricultural areas in the east, the most widely distributed to the tiger, the largest occurrence, the most damaging is the small tiger, has long been valued. Wu Fuzhen published in 1926, “the study of the tiger,” after a lot of research work carried out all over. However, Huaihe in our country, north of Qinling broad line