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小地老虎(Agrotis ypsilon Rott.)在我国从越冬代开始,自南向北迁飞。通过雄蛾体内脂肪含量的测定,发现进入发蛾高峰时,广东曲江迁出地区的雄蛾的含脂率大于30％;华北迁入地区的雄蛾含脂率为10—20％,其中有一部分过境蛾继续向北扩散,到达内蒙古自治区呼和浩特一带定居时,含脂率下降到5％左右。第一代发蛾期,从江南到华北很多地区的雄蛾含脂率都大于20％,除本地的迁出型虫源以外,大部分属过境型,形成覆瓦式迁飞扩散型式。
Agrotis ypsilon Rott. In our country from the beginning of the winter, from south to north to fly. The fat content of male moths was found to be more than 30% when the male moths migrated from Qujiang in Guangdong Province at the peak of their fat content. The fat percentage of male moths migrating to North China was 10-20% Some of the transit moths continue to spread northwards. When they reach the settlement in Hohhot, Inner Mongolia, the fat content drops to about 5%. The first generation of hair moth period, from southern to many parts of North China, male moths contain more than 20% lipid content, in addition to the local migratory insects, most of the transit type, the formation of subsoil migration-diffusion type.