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HOSTS AND DISTRIBUTION OF SPRUCE CONE MAGGOTS (STROBILOMYIA SPP.) (DIPTERA: ANTHOMYIIDAE) AND FIRST RECORD OF STROBILOMYIA APPALACHENSIS MICHELSEN IN CANADA

  • Jean J. Turgeon (a1) and Jon D. Sweeney (a2)

Abstract

Two species of cone maggots, Strobilomyia Michelsen, are known to attack seed cones of spruces in North America. Seed cones of black, red, and white spruce from Newfoundland to Alberta were collected to determine the number of host species and the distribution of these maggots. Strobilomyia appalachensis Michelsen was obtained only from seed cones of black and red spruce, whereas S. neanthracina Michelsen was obtained only from white spruce seed cones. Our observations represent the first record of S. appalachensis in Canada. We conclude that, like S. neanthracina, S. appalachensis has a transcontinental distribution, but exploits different hosts, namely black and red spruce. We also observed that S. appalachensis was capable of extended diapause.

Les cônes d’épinettes indigènes d’Amérique du Nord sont sujets aux attaques de deux espèces de mouches du genre Strobilomyia Michelsen. Le but de ce travail préliminaire est de préciser la répartition géographique respective de ces deux espèces, et d’identifier et de dénombrer leur hôtes grâce à des prélèvements de cônes d’épinettes blanches, noires et rouges provenant de peuplements répartis entre Terreneuve et l’Alberta. Les mouches de S. appalachensis Michelsen ont été récoltées uniquement dans les cônes d’épinettes noires et rouges alors que celles de S. neanthracina provenaient seulement des cônes d’épinettes blanches. Il s’agit de la première mention de S. appalachensis au Canada. Nos résultats démontrent que tout comme S. neanthracina, S. appalachensis à une répartition transcontinentale mais se retrouve sur des hôtes différents, en l’occurrence les épinettes noires et rouges. Nous avons également observé que les pupes de S. appalachensis étaient capables de diapause prolongée.

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HOSTS AND DISTRIBUTION OF SPRUCE CONE MAGGOTS (STROBILOMYIA SPP.) (DIPTERA: ANTHOMYIIDAE) AND FIRST RECORD OF STROBILOMYIA APPALACHENSIS MICHELSEN IN CANADA

  • Jean J. Turgeon (a1) and Jon D. Sweeney (a2)

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