Abstract
Abstract Selection imposed by mating disruption could lead to changes in the pest insect’s chemical communication system if there is genetically based variation in signal and/or response characteristics. Ultimately, this evolution, in the absence of courteracting selection, could lead to resistance to this control tactic. For this reason, the effects of mating disruption on the reproductive success of two pheromone strains of the cabbage looper, Trichoplusia ni (Hubner), were examined in field-cage experiments in which we could monitor mating success. The first experiment evaluated mating disruption using the major component of the cabbage looper pheromone [(Z)-7-dodecenyl acetate: Z7–12:Ac], and the complete pheromone blend emitted by females. The second experiment focused on disruption with the compound that is often most abundant in the pheromone blend of mutant females [(Z)-9-tetradecenyl acetate: Z9-14:Ac], and the complete pheromone blend emitted by mutant females. In the first experiment, mutant ma...
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