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THE MATING STATUS OF FIELD-COLLECTED MALE SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (CLEM.) (LEPIDOPTERA: TORTRICIDAE), IN RELATION TO TRAP LOCATION, SAMPLING METHOD, SAMPLING DATE, AND ADULT EMERGENCE

Published online by Cambridge University Press:  31 May 2012

J.C. Bergh ,
E.S. Eveleigh  and
W.D. Seabrook
J.C. Bergh
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1
E.S. Eveleigh
Affiliation:
Canadian Forestry Service —Maritimes, PO Box 4000, Fredericton, New Bmnswick, Canada E3B 5P7
W.D. Seabrook
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1
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Abstract

Male spruce budworm moths, Choristoneura fumiferana (Clem.), were captured in 1986 and 1987 and the proportion recently mated was determined for each sample. Mating status was examined in relation to trap location, sampling method, sampling date, and adult emergence. On a given day the proportion of recently mated males captured was similar among pheromone-baited traps both within and among test sites. The number of males trapped increased with increasing trap elevation, although there was no difference in the proportion of mated males at each elevation. Males exhibiting “mate-location behaviour” were captured individually with an insect net and were found to be mated in the same proportion as those caught in pheromone-baited traps. The proportion of recently mated males trapped tended to increase during the early part of the flight season, to fluctuate during the middle portion, and then to decline toward the end of the season. This pattern was due, in part, to adult emergence trends.

Résumé

Des papillons mâles de la tordeuse des bourgeons de l’épinette, Choristoneura fumiferana (Clem.), ont été piégés en 1986 et 1987, et la proportion des papillons récemment accouplés a été déterminée dans chaque échantillon. Le statut d’accouplement a été étudié en rapport avec le site de piégeage, la méthode d’échantillonnage, la date de l’échantillon, et l’émergence. Pour une date donnée, la proportion de mâles récemment accouplés était similaire entre pièges à phéromone, et ce aussi bien intra- qu’inter-site. Le nombre de mâles capturés augmentait avec l’élévation du site de capture, bien qu’il n’y avait pas de différence quant à la proportion des mâles accouplés. Des mâles montrant le comportement dit “de recherche ”d’une partenaire" ont été capturés au filet. On a trouvé qu’ils étaient accouplés dans les mêmes proportions que ceux capturés au piège à phéromone. La proportion des mâles récemment accouplés tendait à augmenter durant la première partie de la saison de vol, à fluctuer en mi-saison et ensuite à décroître en fin de saison. Ce patron était dû en partie aux fluctuations de l’émergence des adultes.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 8-9 , September 1988 , pp. 821 - 830
Copyright
Copyright © Entomological Society of Canada 1988

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