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RESPONSES OF MALE SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) TO DIFFERENT CONCENTRATIONS OF SEX PHEROMONE AS MEASURED IN A SUSTAINED-FLIGHT WIND TUNNEL

  • C. J. Sanders (a1), G. S. Lucuik (a1) and R. M. Fletcher (a1)

Abstract

Responses were recorded of male spruce budworm (Choristoneura fumiferana (Clem.)) exposed to natural pheromone and a wide range of concentrations of synthetic pheromone in an all-glass wind tunnel equipped with a moving, patterned ceiling. The numbers of males wing-fanning and plume-following decreased with decreasing concentration of the pheromone plume. Speed of upwind flight with the ceiling stationary increased with decreasing concentration, but the durations of flight sustained by moving the ceiling were not significantly different under the different concentrations.

Males exposed to pheromone produced by calling females showed a higher incidence of plume-following, and flew significantly faster, than males exposed to a similar concentration of synthetic pheromone.

On a enregistré les réactions de mâles de la tordeuse des bourgeons de l’épinette (Choristoneura fumiferana (Clem.)) exposés à un phéromone naturel et à une vaste gamme de concentrations de phéromone synthétique dans un tunnel à soufflerie tout en verre équipé d’un modèle de plafond mobile. Les nombres de mâles battant des ailes et suivant un sillage décroissaient en fonctions directe de la concentration du sillage de la phéromone. La vitesse du vol à contre-courant avec le plafond immobile augmentait en fonction inverse de la concentration, alors que les durées du vol soutenu au moyen du déplacement du plafond ne différaient pas significativement selon les différentes concentrations.

Les mâles exposés à la phéromone produite par des femelles en rut manifestaient une plus forte incidence de poursuite du sillage, et volaient significativement plus vite que les mâles exposés à une concentration similaire de phéromone synthétique.

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References

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RESPONSES OF MALE SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) TO DIFFERENT CONCENTRATIONS OF SEX PHEROMONE AS MEASURED IN A SUSTAINED-FLIGHT WIND TUNNEL

  • C. J. Sanders (a1), G. S. Lucuik (a1) and R. M. Fletcher (a1)

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