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ANTS PREYING ON PUPAE OF THE WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS (LEPIDOPTERA: TORTRICIDAE), IN EASTERN OREGON AND WESTERN MONTANA1

Published online by Cambridge University Press:  31 May 2012

Lorna C. Youngs  and
Robert W. Campbell
Lorna C. Youngs
Affiliation:
Oregon State Department of Agriculture, Salem, Oregon 97310–0110
Robert W. Campbell
Affiliation:
Forestry Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station U.S. Department of Agriculture, Forest Service, Corvallis, Oregon 97331
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Abstract

In 1981 and 1982, the following ant species and numbers were detected preying on pupae of the western spruce budworm, Choristoneura occidentalis Freeman, in eastern Oregon and western Montana: Formica obscuripes Forel, 174; Camponotus modoc Wheeler, 160; C. laevigatus Smith, 53; C. vicinus Mayr, 48; F. podzolica Francoeur, 43; F. accreta Francoeur, 32; F. neorufibarbis Emery, 12; F. lasioides Emery, 1; and Formica sp. (microgyna group). The Camponotus species and F. obscuripes were detected preying on budworm on one-third or more of the trees they foraged.

Résumé

En 1981 et 1982, on a trouvé les espèces et nombres suivants de fourmis s'attaquant à la tordeuse occidentale de l'épinette, Choristoneura occidentalis Freeman, dans l'est de l'Oregon et l'ouest du Montana: Formica obscuripes Forel, 174; Camponotus modoc Wheeler, 160; C. laevigatus Smith, 53; C. vicinus Mayr, 48; F. podzolica Francoeur, 43; F. accreta Francoeur 32; F. neorufibarbis Emery, 12; F. lasioides Emery, 1; et Formica sp. (groupe microgyna). Les espèces de Camponotus ainsi que F. obscuripes s'attaquaient à la tordeuse sur le tiers ou plus des arbres sur lesquels elles fourrageaient.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 12 , December 1984 , pp. 1665 - 1669
Copyright
Copyright © Entomological Society of Canada 1984

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