1992～1996年安庆棉区棉铃虫发生原因分析与防治对策

The Analysis of Affecting Factors and Control Strategies of Cotton Bollworm Occurrence in Anqing Distrect from 1992 to 1996

简述了安庆棉区７０年代以来棉铃虫发生的历史状况，较为详细地阐述了１９９２～１９９６年棉铃虫的发生特点。主要表现在：发生期早、发生量大、发生盛期长、发生范围广。分析自１９９２以来棉铃虫发生量回升，发生程度加重的原因，主要是农田生态条件改变，食料更加丰富，气候条件适宜，天敌控制作用削弱，棉铃虫抗药性发展致使高繁殖力的棉铃虫种群数量急剧增长。根据当地棉铃虫发生的特点及发生原因分析，提出控制棉铃虫为害的根本途径在于加强综合治理，大力推行行之有效的农业、生物和化学防治，强化统的功能，策略上３代防治重点为早发棉田，兼治其他棉田，４代全面防治，５代以中、晚熟棉田为防治重点。

The occurring history of cotton bollworm (Heliothis armigera) had been simply reviewed since 1970s.The occurrinng characters of the bollworm in recent five years were elucidated in detail.The characters showed that the occurring stage was earlier,the popluation larger,the peak of occurrence longer and the occurring areas bigger.The reasons that caused the increasement of the bollworm population and the heavier damage mainly were the change of ecological conditions,such as more abandance of foods,suitable weather conditions,the weakness of natural enemy control system and the development of insecticidal resistant bollworm population.Based on the analysis of those characters and reasons,the basic way to control this insect might be emphasize integrated management and popularize effective agricultural,biological and chemical control methods.In control strategies the focal points should be to pay attention to early occurrence fields and to monitor other cotton fields for the third bollworm generation,overall control for the fourth generation and in middle and late planting cotton fields for the fifth generation.