棉铃虫种群的地理型分化和区域性迁飞规律

对棉铃虫地理种群的遗传变异、滞育性状和抗寒性分化等的系统研究表明,我国棉铃虫由热带型、亚热带型、温带型和新疆型4个地理型组成,各地理型对华南地区、长江流域地区、黄河流域地区和新疆地区的气候环境具有高度专化适应性。受东亚季风影响,5～7月份温带型1代和2代棉铃虫成虫随偏南风向北迁移,可迁入山西北部、河北北部、辽宁等非越冬区的中温带地区。温带型3代和4代棉铃虫于8月中旬以后,随偏北风向南回迁。成虫种群密度过大和所处的不良环境是引起迁飞的主要原因。

Geotype differentiation and regional migratory regularity of Helicoverpa armigera in China

The populations of Helicoverpa armigera in all of China can be divided into four regional groups:the tropical,subtropical,temperate,and Xinjiang geotypes in consideration of the differences in genetic variation,diapause and coldhardiness among geographical populations.Their adaptive zones are respectively in southern China,the middle and lower Changjiang River Valley,the Yellow River Valley(YRV)and the Xinjiang Uygur Autonomous Region.Helicoverpa armigera in China possesses a long-distance migratory behavior.In general,in follow of the seasonal wind of the east Asia,the moths of temperate geotype migrate northeastward into the northern part of YRV such as northern Hebei and Shanxi Provinces and the northeastern China such as Liaoning Province in late spring and early summer.And their offsprings migrate back to middle and southern areas of YRV on northerly winds in late summer and early autumn.