Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) is a major economic pest attacking a variety of crops in Egypt and other Mediterranean countries. S. littoralis has developed resistance to both traditional and novel insecticides. The current study investigated S. littoralis resistance to indoxacarb regarding inheritance mode, realized heritability (h2), and fitness costs. An indoxacarb-resistant strain (Indoxa-SEL) was obtained by selecting a field strain with indoxacarb. Indoxa-SEL strain outperformed the susceptible one (Indoxa-S) by 29.77-fold after 16 consecutive generations of selection. Based on the LC50 values of the progenies of reciprocal crosses F1 (R♂ × S♀) and F1ʹ (R♀ × S♂), S. littoralis resistance to indoxacarb was found to be autosomal and partially recessive. Chi-square tests for goodness-of-fit between observed and expected mortalities of self-bred F1 and resistant strain reciprocal crosses revealed that the resistance was controlled by multiple genes. The resistant strain had a relative fitness of 0.80, with significantly increased total preovipositional period of females, egg, larvae, pupae, preadult, adult, and total longevity period. The estimated realized heritability value in the Indoxa-SEL strain was 0.21. The current study will contribute to sustaining indoxacarb efficacy and designing effective resistance management programs against S. littoralis.

中文翻译：

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斜纹夜蛾（鳞翅目：夜蛾科）对茚虫威的抗性特征：遗传模式、实现的遗传力和适应成本

斜纹夜蛾（Spodoptera littoralis (Boisd.)）（鳞翅目：夜蛾科）是一种主要经济害虫，危害埃及和其他地中海国家的多种农作物。滨夜蛾已经对传统和新型杀虫剂产生了抗药性。目前的研究调查了北沙星对茚虫威的遗传模式、实现遗传力（h2）和适应成本的抗性。通过茚虫威筛选田间菌株，获得茚虫威抗性菌株（Indoxa-SEL）。经过连续 16 代选择后，Indoxa-SEL 菌株的性能比敏感菌株（Indoxa-S）高出 29.77 倍。根据F1（R♂×S♀）和F1ʹ（R♀×S♂）互交后代的LC50值，发现北沙星对茚虫威的抗性是常染色体和部分隐性遗传。对自交 F1 和抗性品系互交的观察死亡率和预期死亡率之间的拟合优度进行卡方检验，结果表明抗性是由多个基因控制的。抗性品系的相对适合度为0.80，雌虫、卵、幼虫、蛹、成虫前期、成虫的总产卵前期时间和总寿命显着增加。Indoxa-SEL 菌株的估计实现遗传力值为 0.21。目前的研究将有助于维持茚虫威的功效并设计针对北沙门氏菌的有效抗性管理计划。