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BIOLOGY OF THE GALLER DIPLOLEPIS ROSAEFOLII (HYMENOPTERA: CYNIPIDAE), ITS ASSOCIATED COMPONENT COMMUNITY, AND HOST SHIFT TO THE SHRUB ROSE THÉRÈSE BUGNET

Published online by Cambridge University Press:  31 May 2012

Joseph D. Shorthouse
Affiliation:
Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6
Scott E. Brooks
Affiliation:
Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6

Abstract

Diplolepis rosaefolii (Cockerell) induces a lenticular gall on the leaves of various roses across Canada. In Ontario and Quebec, D. rosaefolii is found only on Rosa acicularis Lindl., and its galls are inhabited by eight species of parasitoids, the most common being Chrysocharis pentheus (Walker), Orthopelma luteolator (Gravenhorst), and Eupelmus dryorhizoxeni Ashmead. Parasitoids and the inquiline Periclistus sp. make up 48–62% of gall inhabitants. Here we report a population of D. rosaefolii on the hybrid rugosa shrub rose Thérèse Bugnet in a field of experimental roses in Quebec. Only two species of parasitoids and one specimen of Periclistus sp. were associated with these galls.

Résumé

Diplolepis rosaefolii (Cockerell) forme une galle lenticulaire sur les feuilles de divers rosiers au Canada. En Ontaria et au Québec, D. rosaefolii ne se rencontre que sur le rosier Rosa acicularis Lindl. et les galles qu’il forme sont habitées par huit espèces de parasitoïdes dont les plus communes sont Chrysocharis pentheus (Walker), Orthopelma luteolator (Gravenhorst) et Eupelmus dryorhizoxeni Ashmead. Ces parasitoides et une espèce inquiline, Periclistus sp., représentent 48-62% des habitants de ces galles. Nous avons trouvé une population de D. rosaefolii sur le rosier rugosa arbustif hybride Thérèse Bugnet dans un champ de roses expérimentales au Québec. Seulement deux espèces de parasitoïdes et un spécimen de Periclistus sp. étaient associés aux galles de ces rosiers.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1998

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