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1 April 2008 Cross-Resistance and Genetics of Resistance to Indoxacarb in Spodoptera litura (Lepidoptera: Noctuidae)
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Abstract

Bioassays (at generation G1) with a newly collected field population of Spodoptera litura (F.) (Lepidoptera: Noctuidae) from Multan, Pakistan, showed resistance ratios of 15, 23, 37, and 16 for indoxacarb, spinosad, abamectin, and emamectin, respectively, compared with a laboratory susceptible population, Lab-PK. At G1, the field population was selected with indoxacarb by using single pair crosses. For Indoxa-SEL, bioassay at G4 found that selection increased resistance ratio to 95 for indoxacarb compared with Lab-PK. Selection with indoxacarb significantly increased resistance to spinosad and emamectin; however, resistance to abamectin was observed to drop. A significant reduction in the resistance to indoxacarb was observed in Indoxa-SEL at G9, indicating unstable resistance to indoxacarb; however, it was stable for fipronil. Synergism tests with microsomal oxidase and esterase-specific inhibitors suggested that the indoxacarb resistance was associated with microsomal oxidase. Reciprocal genetic crosses between Indoxa-SEL and Lab-PK populations indicated that resistance was autosomal and incompletely dominant. Tests of monogenic inheritance suggested that resistance to indoxacarb was controlled by more than one locus.

Ali H. Sayyed, Munir Ahmad, and Mushtaq A. Saleem "Cross-Resistance and Genetics of Resistance to Indoxacarb in Spodoptera litura (Lepidoptera: Noctuidae)," Journal of Economic Entomology 101(2), 472-479, (1 April 2008). https://doi.org/10.1603/0022-0493(2008)101[472:CAGORT]2.0.CO;2
Received: 29 May 2007; Accepted: 1 September 2007; Published: 1 April 2008
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