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Baited pheromone traps track changes in populations of western blackheaded budworm (Lepidoptera: Tortricidae)

  • V.G. Nealis (a1), P. Silk (a2), R. Turnquist and J. Wu (a2)

Pheromone lures for eastern and western blackheaded budworms, Acleris variana (Fernald) and A. gloverana (Walsingham), were synthesized and deployed in traps at locations with decreasing and increasing populations of western blackheaded budworms in British Columbia, Canada. Traps baited with these lures caught comparable numbers of moths at all sites tested in each year. The lures were sensitive to changes in density of budworm populations below observable damage levels, and numbers of moths in traps were strongly correlated with independent estimates of egg densities in the same year. The results confirm the qualitative similarity of the sex pheromones in eastern and western species of blackheaded budworm and demonstrate their utility as a tool for monitoring population trends, including increases in populations to damaging levels.


Deux appâts à base de phéromone pour les tordeuses à tête noire de l'épinette de l'est et de l'ouest, Acleris variana (Fernald) et A. gloverana (Walsingham), ont été préparés et déployés en Colombie-Britannique au Canada, dans des pièges situés au sein de sites positifs où les populations de tordeuses sont soit en baisse, soit en augmentation. Le taux de capture des papillons nocturnes avec ces appâts à chaque site est comparable à ceux des sites testés auparavant. Les appâts ont démontré une sensibilité envers les changements en densité de population de tordeuses inférieure au seuil de détection visuelle de niveaux de dommage, ainsi qu'une forte corrélation entre le taux de capture des pièges et l'estimation indépendante de densité des œufs, à l'intérieur de la même année. Les résultats confirment la similarité qualitative des phéromones sexuelles des tordeuses à tête noire de l'épinette de l'est et de l'ouest, et démontrent leur utilisation comme outil de surveillance des tendances des populations, même jusqu'aux niveaux épidémiques.

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The Canadian Entomologist
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