Canadian Forest Service Publications
Does insecticide resistance influence the reproductive success of the obliquebanded leafroller, Choristoneura rosaceana? (poster): Poster PO45. 2000. Delisle, J.; Vincent, C. Page 45 in Scientific Program and Abstracts, Proceedings: 17th Annual Meeting of the International Society of Chemical Ecology. August 15-19, 2000, Poços de Caldas, Minas Gerais State, Brazil. Kluwer Academic/Plenum Publishers, New York, New York.
Available from: Laurentian Forestry Centre
Catalog ID: 20793
CFS Availability: Not available through the CFS (click for more information).
The present study examines the impact of insecticide resistance on the periodicity of the calling behaviour and pheromone production in different-aged virgin females of the obliquebanded leafroller, Choristoneura rosaceana Harris (Lepidoptera: Tortricidae). While both resistant and susceptible females initiated calling on the first night following emergence, the periodicity of the calling behaviour significantly differed between the two strains. Resistant females started calling significantly later in the night and called for a shorter period than susceptible individuals. However, since resistant females advanced their onset time of calling as they aged while susceptible females did not, the difference observed between strains was more pronounced in younger than older females. Furthermore, as the time spent calling increased with age in both resistant and susceptible females, the difference between individuals of the two strains remained fairly constant for each night of calling. Overall, pheromone production significantly decreased with female age; however, the decline was more pronounced in resistant than susceptible individuals. Thus resistant females may have a lower mating success. Male mating success and spermatophore size generally declined with successive matings for both strains, but there was no significant difference between susceptible and resistant individuals. Further research is required as resistant males are smaller and may be disadvantaged through female choice and/or may respond differentially to pheromone source compared to susceptible individuals. If the reproductive success of both sexes is affected, this may have a major influence on the dynamics of insecticide resistance in the presence and absence of selection in C. rosaceana populations.
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