We investigated the genetic basis of adult behavioral response and larval physiological tolerance to permethrin within two diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), populations from Wooster and Celeryville, OH, with different average levels of larval tolerance. The adult behavioral response was measured as oviposition site preference and was investigated using full-sib design and parent-offspring regression. Additive genetic variance (0.134 ± 0.02) and the heritability (h2 = 0.31 ± 0.08) for the behavioral response was significant for the Celeryville population, suggesting that in this population, a high proportion of phenotypic variation for adult behavioral response to permethrin was heritable genetic variation. The larval physiological response was measured with a topical application bioassay and was investigated using a half-sib design. Significant additive genetic variances and heritabilities for physiological tolerance to permethrin were detected in both populations. The genetic correlation between adult behavioral response and larval physiological tolerance to permethrin were negative, but significant only in the Celeryville population; indicating that adults from this population that are more behaviorally responsive produced offspring that are more susceptible to permethrin. Our findings have implications for the evolution and management of insecticide resistance in the diamondback moth. The adult behavioral response can lower the exposure of larvae to the insecticide, lowering selection pressure for physiological resistance in larvae. Furthermore, to the extent that the adult behavioral response increases fitness, it can indirectly select for larval susceptibility because of the negative correlation between the two traits.
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Vol. 99 • No. 4