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小地老虎(Agrotis ypsilon R.)是我国的一种重要地下害虫,在我州一些地区主要以早期幼虫危害玉米、马铃薯等农作物幼苗。据调查,在昭觉地区四、五月份玉米因受小地老虎危害造成缺窝达5.4—17.1％;1977年大发生时,四开地区1800多亩受害,有虫株率达57.3％,缺窝率占18％,经饲养观察,小地老虎占91.4％,烂坝地区700多亩马铃薯受小地老虎危害,为害株率8.4％,对农业生产威胁很大。 为了摸清小地老虎的越冬情况,我们于1977年12月至1978年2月,对我州高山,二半山和低山河谷地区的布拖、昭觉、甘洛和金阳等县的部份
Agrotis ypsilon R. is an important underground pest in our country. In some areas of our country, early larvae are used to endanger crop seedlings such as corn and potato. According to the survey, in April and May in Zhaojue Prefecture, the maize due to the damage caused by the small Tigers caused an absent nest of 5.4-1.17.1%. In 1977, 1800 mu of land in Sikai area suffered from insect damage with a rate of 57.3% The nest rate of 18%, after feeding observation, the small tiger accounted for 91.4%, rabe area 700 acres of potato by the small tiger damage, 8.4% of harmful plants, a great threat to agricultural production. In order to find out the overwintering situation of the small tigers, we conducted a series of investigations on the overwintering conditions of the small tigers, from December 1977 to February 1978, to the departments of Burao, Zhaojue, Ganluo and Jinyang in the high mountains, Copies