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INSECT AND MITE ASSOCIATES OF SCOLYTUS MULTISTRIATUS (COLEOPTERA: SCOLYTIDAE) IN CALIFORNIA1

Published online by Cambridge University Press:  31 May 2012

Ann E. Hajek
Affiliation:
Division of Biological Control, University of California, Berkeley 94720
Donald L. Dahlsten
Affiliation:
Division of Biological Control, University of California, Berkeley 94720

Abstract

Thirty-four species of insects associated with Scolytus multistriatus (Marsham) were reared or collected from several species of elm collected throughout California. Few of these species occurred in large numbers and many of their ecological roles in this subcortical habitat are unknown. Predators were uncommon; only 6 species of parasitic Hymenoptera were reared, 3 of which were not previously known from California. One, Dendrosoter protuberans (Nees), had previously been released for biological control of S. multistriatus only as far west as Colorado. The most abundant insect associate reared from northern California, Cheiropachus quadrum (F.), exhibited a maximum percentage parasitism of 2%. Seven species of mites, including 2 new species, were also collected in association with S. multistriatus.

Résumé

Trente-quatre espèces d'insectes associés au Scolytus multistriatus (Marsham) ont été élevées ou collectionnées sur plusieurs espèces d'ormes partout en Californie. Peu de ces espèces étaient nombreuses et pour plusieurs, leur rôle écologique dans cet habitat sous-cortical est inconnu. Les prédateurs étaient peu communs; seulement 6 espèces d'hyménoptères parasitiques ont été élevées, dont 3 sont nouvelles pour la Californie. L'une d'entre elles, Dendrosoter protuberans (Nees), avait antérieurement été relâchée comme auxiliaire de lutte contre le S. multistriatus, mais pas à l'ouest du Colorado. L'associé le plus abondant du scolyte au nord de la Californie, Cheiropachus quadrum (F.), a montré un pourcentage maximum de parasitisme de 2%. Sept espèces d'acariens dont 2 nouvelles ont été collectionnées en association avec le S. multistriatus.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1985

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