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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
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

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
Copyright
Copyright © Entomological Society of Canada 1984

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