Wu Kongming, Guo Yuyuan
Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China.
Pest Manag Sci. 2004 Jul;60(7):680-4. doi: 10.1002/ps.848.
The changes in the susceptibility of the cotton bollworm, Helicoverpa armigera (Hübner) to three insecticides (lambda-cyhalothrin, phoxim and endosulfan) commonly used for control of this pest in China were monitored by bioassays at various generations. The insects were originally collected from Bt cotton fields and selected with Cry1Ac over 44 generations. In comparison with a susceptible strain, the larval resistance of the Bt-selected populations to Cry1Ac toxin increased 106-fold. Simultaneously, the resistance levels to lambda-cyhalothrin, phoxim and endosulfan declined dramatically. The results indicated no positive cross-resistance between Cry1Ac toxin and the insecticides. Evidence of the lack of cross-resistance to three commonly used synthetic insecticides in our laboratory-derived Cry1Ac-resistant population may suggest that growers can confidently use these insecticides if and when resistance to Cry1Ac cotton does occur.
通过生物测定法对不同世代的棉铃虫（Helicoverpa armigera (Hübner)）对中国常用的三种杀虫剂（高效氯氟氰菊酯、辛硫磷和硫丹）的敏感性变化进行了监测。这些昆虫最初采自Bt棉田，并经Cry1Ac筛选超过44代。与敏感品系相比，经Bt筛选的种群对Cry1Ac毒素的幼虫抗性增加了106倍。同时，对高效氯氟氰菊酯、辛硫磷和硫丹的抗性水平急剧下降。结果表明Cry1Ac毒素与这些杀虫剂之间不存在正向交互抗性。我们实验室培育的Cry1Ac抗性种群对三种常用合成杀虫剂缺乏交互抗性的证据可能表明，当棉铃虫对Cry1Ac棉花产生抗性时，种植者可以放心使用这些杀虫剂。
