Abstract Soybean looper (SBL), Chrysodeixis includens (Lepidoptera: Noctuidae), is one of the main lepidopteran pests of soybean and cotton crops. In this study, we selected a strain of SBL with resistance to lambda-cyhalothrin and evaluated the inheritance, fitness costs and cross-resistance to deltamethrin and cypermethrin. In inheritance pattern studies, SBL larvae were exposed to technical grade insecticides in topical bioassays. To investigate fitness costs, SBL strains were reared on artificial diet without insecticide and the survival, development and reproductive rates were evaluated. Estimated LD50 values of lambda-cyhalothrin for the susceptible and resistant strains were 0.0015 and 0.11 μg a.i./larva, respectively, indicating a resistance ratio (RR) of 73.3-fold. The LD50 values of heterozygous were 0.016 and 0.017 μg a.i./larva, suggesting an autosomal inheritance of resistance. On lambda-cyhalothrin sprayed-leaves, the resistant strain showed >85% survival. By contrast, heterozygous and susceptible strains had

中文翻译：

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λ-三氯氟氰菊酯抗性的遗传、适应成本和与大豆环虫、Chrysodeixis includens（鳞翅目：夜蛾科）中其他拟除虫菊酯的交叉抗性

摘要 大豆钩虫(SBL)，Chrysodeixis includens (Lepidoptera: Noctuidae)，是大豆和棉花作物的主要鳞翅目害虫之一。在本研究中，我们选择了对 λ-三氯氟氰菊酯具有抗性的 SBL 菌株，并评估了对溴氰菊酯和氯氰菊酯的遗传、适应性成本和交叉抗性。在遗传模式研究中，SBL 幼虫在局部生物测定中暴露于工业级杀虫剂。为了调查适应成本，SBL 菌株在没有杀虫剂的人工饲料中饲养，并评估了存活率、发育率和繁殖率。λ-三氯氟氰菊酯对敏感菌株和抗性菌株的估计 LD50 值分别为 0.0015 和 0.11 μg ai/幼虫，表明抗性比 (RR) 为 73.3 倍。杂合子的 LD50 值为 0.016 和 0.017 μg ai/幼虫，表明耐药性常染色体遗传。在喷洒λ-三氯氟氰菊酯的叶子上，抗性菌株显示>85% 的存活率。相比之下，杂合子和敏感菌株有