小地老虎(Agrotis ypsilon Rott.)是世界性害虫,也是我国农业生产上的重要害虫。国内外许多昆虫学者根据它的为害季节分布界线,不同地区或同一地区不同海拔高度的季节性突减突增的衔接现象;在一个很大范围的地区内同期出现突增突减现象;雌蛾卵巢发育进度的地区性季节变化;在我国北纬33°以北不能越冬,北纬25°以南夏季有绝迹现象;同一世代成虫从南到北其体内脂肪含量呈现有规律的递减;全国从南到北测定多点幼虫对同一种药剂抗性无显著差异;以及在没有生存条件的雪山、沙漠、海 Agrotis ypsilon Rott. Is a worldwide pest and is also an important pest of agricultural production in our country. Many entomologists at home and abroad, according to the season of its distribution of harmful seasonal convergence, different regions or the same region at different altitudes suddenly sudden sudden convergence phenomenon; in a large area over the same period sudden drop phenomenon; female moth Ovarian development in the region of seasonal changes in China’s north latitude 33 ° north can not wintering, 25 ° south latitude in summer extinction phenomenon; the same generation of adults from south to north its body fat content showed a regular decline; the country from south to Northern determination of multi-point larvae on the same drug resistance no significant difference; and in the absence of living conditions in the mountains, deserts, sea