目的 评估淡色库蚊抗药性测定中容器类型对结果的影响,确定能否用一次性杯子代替玻璃烧杯进行实验,从而达到提高实验效率的目的。方法 从野外采集淡色库蚊幼虫,用WHO推荐的幼虫浸渍法,分别测定在玻璃烧杯、一次性塑料杯或一次性纸杯3种容器类型下,淡色库蚊幼虫对溴氰菊酯、仲丁威和双硫磷的LC50及95%可信区间(95%CI),并比较其差异。结果 在玻璃烧杯、一次性塑料杯和一次性纸杯依次作为实验容器的条件下,淡色库蚊幼虫对溴氰菊酯的LC50及95%CI分别为0.002 009(0.001 654~0.002 449)、0.003 858(0.003 062~0.005 224)和0.005 459(0.004 051~0.008 757) mg/L,玻璃杯与2种一次性杯子间的结果差异有统计学意义;对仲丁威的LC50及95%CI分别为0.3470(0.3059~0.3821)、0.2575(0.2118~0.3095)和0.4844(0.4460~0.5232) mg/L,玻璃杯与一次性塑料杯差异无统计学意义,与一次性纸杯差异有统计学意义;而对双硫磷的LC50及95%CI分别为0.000 955(0.000 816~0.001 094)、0.003 007(0.002 661~0.003 407)和0.003 830(0.003 450~0.004 256) mg/L,玻璃杯与2种一次性杯子间差异均有统计学意义。用不同杯子测定蚊幼虫对杀虫剂的敏感性,溴氰菊酯的测定结果受浓度的影响小于双硫磷;双硫磷浓度越高杯子的影响越小。结论 在对蚊幼虫的抗药性测定中,玻璃杯是最佳选择,而一次性杯子可能因对杀虫剂有吸附作用而使测定的结果发生偏差,使用一次性杯子替代玻璃杯时应该特别注意现做评估。
Objective To investigate the influence of containers on the insecticide resistance bioassay among Culex pipiens pallens larvae, and to determine whether disposable cups can replace glass beakers in these tests with the purpose of increasing experimental efficiency. Methods Using wild Cx. pipiens pallens larvae, the susceptibility of larvae (LC50 with 95%CI) to deltamethrin, temephos, and BMPC was determined using the glass beaker, disposable plastic cup, or disposable paper cup, with impregnation method as recommended by WHO, and the LC50 values measured using different containers were compared. Results The LC50 (95%CI) values of Cx. pipiens pallens larvae to deltamethrin measured using the glass beaker, disposable plastic cup, and disposable paper cup were 0.002 009 (0.001 654-0.002 449), 0.003 858 (0.003 062-0.005 224), and 0.005 459 (0.004 051-0.008 757) mg/L, respectively; there were significant differences in LC50 value between the glass beaker group and the other two groups. To temephos, the LC50 (95%CI) values were 0.000 955 (0.000 816-0.001 094), 0.003 007 (0.002 661-0.003 407), and 0.003 830 (0.003 450-0.004 256) mg/L, respectively; there were significant differences between the glass beaker group and the other two groups. To BMPC, the LC50 (95%CI) values were 0.3470 (0.3059-0.3821), 0.2575 (0.2118-0.3095), and 0.4844 (0.4460-0.5232) mg/L, respectively; there was a significant difference between the glass beaker group and disposable paper cup group, but no significant difference was found between the glass beaker group and disposable plastic cup group. The susceptibility of Cx. pipiens pallens larvae to deltamethrin was less concentration-dependent as compared with that to temephos; with increasing temephos concentration, susceptibility became less dependent on different types of containers. Conclusion In the bioassay of Cx. pipiens pallens larvae’s resistance to insecticide, glass breaker is the best choice. Disposable cups may affect the results due to adsorption of pesticides. Special attention should be paid when using disposable cups instead of the glass beaker, and evaluation should be performed in these situations.
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