Abstract
Census, age-grading techniques, and bioassays were applied to mostly pyrethroid-resistant or mostly susceptible horn fly, Haematobia irritans L., populations in 1985-1990, some of which were undergoing disruptive selection for both traits. Bioassays showed that resistant phenotypes declined rapidly on untreated cattle. Age structures, fecundity, body sizes, and reproductive success of horn fly populations varied significantly among herds, but not according to insecticidal treatment. This result suggests that adult male and female survival rates and female reproductive success of resistant and susceptible phenotypes were not greatly different. Life-history traits that were correlated with insecticide-resistant or susceptible phenotypes were thus too small in magnitude to be detected.
Published Version
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