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小地老虎(Agrotis ypsilon)在江苏一带,每年春季都有很大的蛾量出现,与为数极少的越冬虫量很不相符。这批虫源是哪里来的?有人推测是外地迁飞来的,有人则认为是本地越冬的。富有启发性的问题是:小地老虎在我国不但有种种迁飞的迹象,而且越冬代蛾常与粘虫、(Mythimna separata)同期发生,有明显的同步关系。粘虫具有远距离迁飞习性,在国内已为研究所证实,因此深入探讨它们之间的同步现象,就能为小地老虎的迁飞提供旁证,有利于搞清越冬代蛾的虫源性质。
Agrotis ypsilon In Jiangsu Province, there is a large amount of moth occurring every spring, which is not in accordance with the extremely small amount of overwintering insects. Where do these insects originate? Some people speculate that they are migrating from other places, while others think that they are overwintering. The enlightening question is: The small tiger not only shows signs of migration in our country, but also has obvious synchronization with the Mythimna separata overwintering. Mythimna separata have long-distance migratory behavior and have been confirmed by the institute in our country. Therefore, in-depth discussion of the synchronization between them can provide evidence for the migration of the small tiger to facilitate the identification of the origin of the overwintering moth .