The over-winter cardinal number of meadow moth was very small in lawn in Changsha area, and they were a number of meadow moths coming from other places, not from the Changsha area.
草地螟在长沙地区草坪越冬基数很小，在长沙地区为害的多为外地迁入的虫源，为害程度主要取决于异地越冬代成虫迁入量的多少。
We analyzed the weather background during the major immigration period in 1999, and stimulated temporal-spatial dynamics of wind field and migration trajectories of the meadow moth.
本文分析了1999年各地草地螟主要迁入峰期的天气学背景，并对风场的时空分布及草地螟迁飞轨迹进行了模拟。
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