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EFFECTS OF PHOTOPERIOD AND SIZE ON FLIGHT ACTIVITY AND OVIPOSITION IN THE EASTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

  • C. J. Sanders (a1) and G. S. Lucuik (a1)

Abstract

Well-fed, mated female spruce budworm (Choristoneura fumiferana (Clem.)) show little activity during the first 24 h after emergence. During the second 24 h they lay between 33 and 50% of their egg complement. During the third 24 h most flight activity occurs. Smaller, artificially starved females are much more active, especially during the second 24-h period, when many fly before ovipositing. Timing of oviposition and flight is under photoperiodic control: female flight occurs just before dark after peak oviposition while male activity starts before dark, but peaks after dark, with a morning peak of variable intensity.

Les femelles bien nourries et déjà accouplées de la Tordeuse des bourgeons de l’Épinette (Choristoneura fumiferana (Clem.)) ne sont pas très actives au cours des premières 24 h après leur émergence. Pendant la deuxième période de 24 h, elles déposent entre 33 et 50% de leur complément d’oeufs. Pendant la 3e 24 h, c’est surtout leur activité de vol. Les femelles plus petites, affamées artificiellement, se révèlent beaucoup plus actives, surtout durant la deuxième période de 24 h, alors que plusieurs volent avant de pondre. Le temps de la ponte et du vol est contrôlé par la photopériode : les femelles volent au crépuscule après leur ponte maximale, tandis que l’activité des mâles débute au crépuscule mais est maximale durant la nuit, outre un autre maximum matinal d’intensité variable.

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References

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EFFECTS OF PHOTOPERIOD AND SIZE ON FLIGHT ACTIVITY AND OVIPOSITION IN THE EASTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

  • C. J. Sanders (a1) and G. S. Lucuik (a1)

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