Cochran D G
Department of Entomology, Virginia Polytechnic Institute & State University, Blacksburg 24061-0319.
J Econ Entomol. 1991 Oct;84(5):1412-6. doi: 10.1093/jee/84.5.1412.
Selection experiments with a pyrethrins-susceptible and a pyrethrins-resistant strain of German cockroaches, Blattella germanica (L.), were conducted for 17 generations with either permethrin or fenvalerate as the selecting agent. Large nymphs were left on treated glass surfaces for extended periods of time each generation. Mortality was assessed at 24 h. The level of resistance was determined periodically by time-mortality testing. The VPI-susceptible strain served as the basis for comparison. The pyrethrins-susceptible strain developed resistance to pyrethrins early in the selection process; this strain ultimately became resistant to allethrin, phenothrin, permethrin, fenvalerate, cyfluthrin, and cypermethrin. Fenvalerate caused faster development of resistance than did permethrin. The pyrethrins-resistant strain, selected with fenvalerate, quickly became resistant to allethrin, permethrin, phenothrin, and fenvalerate. Ultimately, it developed resistance to all nine pyrethroids tested.
用氯菊酯或氰戊菊酯作为选择剂，对德国小蠊（Blattella germanica (L.)）的除虫菊酯敏感品系和除虫菊酯抗性品系进行了17代的选择实验。每一代都将大龄若虫长时间放置在经过处理的玻璃表面上。在24小时时评估死亡率。通过时间-死亡率测试定期确定抗性水平。VPI敏感品系作为比较的基础。除虫菊酯敏感品系在选择过程早期就对除虫菊酯产生了抗性；该品系最终对烯丙菊酯、苯醚菊酯、氯菊酯、氰戊菊酯、氟氯氰菊酯和氯氰菊酯产生了抗性。氰戊菊酯比氯菊酯导致抗性发展得更快。用氰戊菊酯选择的除虫菊酯抗性品系很快对烯丙菊酯、氯菊酯、苯醚菊酯和氰戊菊酯产生了抗性。最终，它对测试的所有九种拟除虫菊酯都产生了抗性。
