Inheritance of resistance to esfenvalerate in Colorado potato beetles (Coleoptera : Chrysomelidae)

The inheritance of resistance to esfenvalerate in Colorado potato beetles, Leptinotarsa decemlineata (Say), was examined using quantitative genetic an alysis. Selection on a held-resistant strain was conducted for 2 generation s to estimate the realized heritability of esfenvalerate resistance. Bioass ay data from selection experiments indicated that the resistant strain had little genetic variation in esfenvalerate susceptibility, because the resis tance level was not significantly increased compared with the initial labor atory generation. The realized heritability was estimated as 0.45, indicati ng a moderate heritability, although it was not significant. The log LD,, v alue was partitioned into several components after, bioassay data of F-1 pr ogeny from reciprocal crosses indicated that esfenvalerate resistance was i nherited in a sex-linked, semirecessive fashion. Partitioning of the log LD S, value detected significant additive and dominant effects of sex chromoso mal factor(s) but not autosomal factor(s). Based on the detected effects, t he degree of dominance of esfenvalerate resistance was estimated as 0.262, indicating esfenvalerate resistance was semirecessive. This study confirmed that resistance to esfenvalerate in Colorado potato beetles was sex-linked , semirecessive.