在南通棉区，棉铃虫从价oveFpaampra（ffebner）属间隙暴发性害虫，以四代为主害代。对年代至今，棉铃虫已数度暴发，特别是进入如年代以来，爆发频率明显增加，为害更加严重。因此，做好四代棉铃虫发生趋势预报，及早掌握防治主动权，是取得防治成效减少棉花损失的重要保证。 In the Nantong cotton area, the cotton bollworm valence oveFpaampra (ffebner) is a gap-prone pests, the main generation of the generation of four generations. To date, the cotton bollworm has been experiencing several outbreaks, especially since entering the age. Since then, the frequency of outbreaks has risen sharply and the damage has become more serious. Therefore, to do a good job of forecasting the occurrence of the fourth generation cotton bollworm and to take the initiative in prevention and control as early as possible is an important guarantee for reducing the cotton loss through prevention and control.