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首页> 外文期刊>Journal of Medical Entomology >Laboratory selection for resistance to Bacillus sphaericus in Culex quinquefasciatus (Diptera: Culicidae) from California, USA
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Laboratory selection for resistance to Bacillus sphaericus in Culex quinquefasciatus (Diptera: Culicidae) from California, USA

机译：美国加利福尼亚州库蚊（Culex quinquefasciatus（Diptera：Culicidae））对球形芽孢杆菌抗性的实验室选择

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A previously untreated field population of Culex quinquefasciatus Say, collected near Bakersfield, CA, was subjected to intensive laboratory selection with the bacterial insecticide Bacillus sphaericus Neide (strain 2362) at a level producing 95% mortality. Resistance rapidly appeared and resistance levels increased such that fourth instars of generation 12 were able to survive a concentration of B. sphaericus that was 7,000 times higher than the median lethal concentration (LC_50) of the susceptible reference colony. Similar resistance levels were detected in first instars. Crossresistance in the selected colony was detected toward B. sphaericus strains 1593 and 2297, but little or no cross-resistance was observed toward B. sphaericus strains IAB59 or ISPC5 (=WHO 2173). Cross-resistance also was not detected toward the bacterial insecticide Bacillus thuringiensis subsp. israelensis, toward a recombinant strain expressing both B. thuringiensis subsp, israelensis and B. sphaericus (strain 1593) toxins, toward individual or multiple toxins from B. thuringiensis subsp. israelensis, or toward conventional synthetic insecticides. Genetic analysis revealed that B. sphaericus resistance was inherited as a recessive trait and controlled by a single major locus. These data are discussed in relation to cases of field resistance toward this biopesticide in the Cx. pipiens (L.) complex.
机译：在加利福尼亚州贝克斯菲尔德附近收集的先前未处理的库克斯库克斯奎克斯藻说的野外种群，经过细菌杀灭剂球形芽孢杆菌奈德（菌株2362）的严格实验室选择，产生的死亡率为95％。抗药性迅速出现，抗药性水平提高，因此第12代第四龄幼虫能够存活的球形芽孢杆菌浓度比易感参考菌落的中值致死浓度（LC_50）高7,000倍。在第一龄幼虫中检测到相似的抗性水平。在所选菌落中发现了对球形芽孢杆菌菌株1593和2297的交叉抗性，但对球形芽孢杆菌IAB59或ISPC5（= WHO 2173）却观察到很少或没有交叉抗性。对细菌杀虫剂苏云金芽孢杆菌亚种也未检测到交叉抗性。以色列，针对表达苏云金芽孢杆菌亚种，以色列和球形芽孢杆菌（菌株1593）毒素的重组菌株，针对苏云金芽孢杆菌亚种的单个或多种毒素。以色列，或用于常规合成杀虫剂。遗传分析表明，球形芽孢杆菌抗性被遗传为隐性性状，并由单个主要基因座控制。讨论了这些数据与Cx中对这种生物农药的田间抗药性情况。 pipiens（L.）复合体。

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