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PARASITISM IN SUSTAINED AND COLLAPSING POPULATIONS OF THE JACK PINE BUDWORM, CHORISTONEURA PINUS PINUS FREE. (LEPIDOPTERA: TORTRICIDAE), IN ONTARIO, 1985–1987

Published online by Cambridge University Press:  31 May 2012

V.G. Nealis
V.G. Nealis
Affiliation:
Forestry Canada, Ontario Region, PO Box 490, Sault Ste. Marie, Ontario, Canada P6A 5M7
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Abstract

Sixteen species of parasitoids were found attacking outbreak and collapsing populations of the jack pine budworm, Choristoneura pinus pinus Free. (Lepidoptera: Tortricidae), in several plots in northeastern and northwestern Ontario. The patterns of parasitism were similar among widely separated plots with only a few species consistently dominating the parasitoid fauna. The greatest difference in the pattern of parasitism was between sustained and collapsing infestations. Collapsing populations of jack pine bud-worm were associated with relatively high levels of parasitism by Meteorus trachynotus Vier. (Hymenoptera: Braconidae) and Lypha setifacies (West.) (Diptera: Tachinidae) which attacked the late larval stages of the budworm. The results are discussed in comparison with other jack pine budworm studies and with spruce budworm population studies.

Résumé

Seize espèces de parasitoïdes ont été trouvées chez des populations épidémiques et des populations en déclin de la Tordeuse du pin gris Choristoneura pinus pinus Free. (Lepidoptera : Tortricidae) en plusieurs grilles-échantillons du nord-est et du nord-ouest de l’Ontario. Le parasitisme suivait partout les mêmes patterns, même dans les grilles-échantillons éloignées les unes des autres, et la faune des parasitoïdes était toujours dominée par quelques espèces. Les plus grandes différences ont été trouvées entre les infestations en progrès et les infestations en déclin. Les populations en déclin des tordeuses étaient associées à de fortes concentrations de Meteorus trachynotus Vier. (Hymenoptera : Braconidae) et de Lypha setifacies (West.) (Diptera : Tachinidae) qui attaquent les stades larvaires avancés des tordeuses. Les résultats sont comparés à ceux obtenus au cours d’études sur d’autres populations de la Tordeuse du pin gris et sur des populations de Tordeuses des bourgeons de l’épinette.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 5 , October 1991 , pp. 1065 - 1075
Copyright
Copyright © Entomological Society of Canada 1991

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