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SPRUCE CONE AXIS MIDGE, DASINEURA RACHIPHAGA TRIPP (DIPTERA: CECIDOMYIIDAE), IN CONES OF BLACK SPRUCE, PICEA MARIANA (MILL.) B.S.P.

Published online by Cambridge University Press:  31 May 2012

Y.H. Prévost
Affiliation:
School of Forestry, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1

Abstract

The development of spruce cone axis midge, Dasineura rachiphaga Tripp, and its parasitoids, Platygaster lucida Fouts and Torymus sp., was studied in relation to the availability and development stage of black spruce, Picea mariana (Mill.) B.S.P., cones.

Spruce cone axis midge inhabiting black spruce cones appeared to undergo an extended diapause. This phenomenon probably was related to the production of cones. Platygaster lucida also appeared to undergo extended diapause and the proportion of P. lucida extending their diapause paralleled that of spruce cone axis midge which suggested a close dependance to their host.

Spruce cone axis midge, P. lucida, and Torymus sp. emerged from mature cones about the same time and were closely synchronized with the availability of black spruce flowers.

External morphological characters of the spruce cone axis midge that separate the two sexes in the pupal stage were described.

Résumé

Le développement de la cécidomyie du cône de l’epinette, Dasineura rachiphaga Tripp, et ses parasitoïdes, Platygaster lucida Fouts et Torymus sp., à été étudié par rapport à la disponibilité et le stade développemental des cônes de l’epinette noire, Picea mariana (Mill.) B.S.P.

La cécidomyie habitant les cônes de l’épinette noire semblait démontré une diapause prolongée. Le phénomène était lié probablement à la production de cône. Platygaster lucida aussi semblait démontré une diapause prolongée. La proportion de P. lucida prolongeant leur diapause était parallèle à celle de la cécidomyie ce qui suggère un lien étroit à leur hôte.

L’émergence de la cécidomyie, P. lucida et Torymus sp. des cônes mûrs était sychronisée étroitement avec la présence des fleurs.

Les charactères morphologiques externes de la cécidomyie qui distinguent les sexes au stade pupal sont présentés.

[Traduit par l’auteur]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1990

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