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DISTRIBUTION OF WESTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) INSECT PARASITES IN THE CROWNS OF HOST TREES

Published online by Cambridge University Press:  31 May 2012

J. M. Schmid
J. M. Schmid
Affiliation:
USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado 805261
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Abstract

Percentage parasitism by seven insect parasites of the western spruce budworm, Choristoneura occidentalis Freeman, was not significantly different among crown aspects. Parasitism by two hymenopterous parasites was significantly different among crown levels in either one or both hosts. Other parasites were either insufficiently abundant to provide an adequate test, or percentage parasitism differed insignificantly among crown levels or host types. Because percentage parasitism was not generally different among crown levels, any level could have been sampled.

Résumé

Le pourcentage de parasitisme par sept espèces d’insectes parasitant la tordeuse occidentale de l’épinette, Choristoneura occidentalis Freeman, n’a pas montré de différence significative entre différentes formes de cimes. Le parasitisme par deux hyménoptères a varié significativement entre différents niveaux de cime chez l’un et l’autre ou les deux hôtes. Pour les autres parasites, soit qu’ils n’étaient pas assez abondants pour permettre un test valable, soit que le pour-centage de parasitisme ne différait pas significativement entre les niveaux de cime ou les types d’hôte. Parce qu’en général le pourcentage de parasitisme n’a pas montré de différence entre les niveaux de cime, l’échantillonnage aurait pu être fait à n’importe quel niveau.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 12 , December 1981 , pp. 1101 - 1106
Copyright
Copyright © Entomological Society of Canada 1981

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References

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