论文部分内容阅读
用一定剂量的Bt制剂处理不同种群、不同发育期的棉铃虫,24h后测定它们对氰戊菊酯的反应。结果表明,不管是抗性种群还是敏感种群,棉铃虫经Bt预处理后与未处理对照相比,都表现为2～4龄幼虫的敏感性明显提高,而卵、初孵、1龄末幼虫敏感性变化不明显,DE-R种群敏感性变化幅度>96HN-R种群>YZ-S种群;以YZ-S为敏感基线比较96HN-R种群和DE-R种群的抗性倍数变化,发现卵和1龄幼虫经Bt预处理后相对抗性倍数变化最大,DE-R种群的变化明显大于96HN-R种群。
A certain dose of Bt preparation was used to treat different populations and different developmental stages of cotton bollworm and their response to fenvalerate was determined after 24h. The results showed that the susceptibility of 2nd and 4th instar larvae to H. armigera increased significantly after pretreatment with Bt compared with the untreated control, both in the resistant and susceptible populations. The sensitivity of DE-R population was not significantly different from that of DE-R population> 96HN-R population> YZ-S population. The change of resistance fold between 96HN-R and DE- And the first instar larvae Bt pretreatment relative fold change the greatest change, DE-R population was significantly greater than the 96HN-R population.