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HOST SHIFT OF THE LEAF GALLER DIPLOLEPIS POLITA (HYMENOPTERA: CYNIPIDAE) TO THE DOMESTIC SHRUB ROSE ROSA RUGOSA

Published online by Cambridge University Press:  31 May 2012

J.D. Shorthouse
J.D. Shorthouse
Affiliation:
Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6
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Abstract

The leaf galler Diplolepis polita (Ashmead), known only from Rosa acicularis Lindl. west of the Rocky Mountains, is recorded for the first time on the introduced, urban shrub rose Rosa rugosa Thunb. Inquilines and parasitoids commonly kill over 90% of the inducers in populations of galls found in natural habitats, whereas 55% of the galls from the urban roses contained an inducer. Differences in component communities associated with galls on domestic and wild roses are likely indicative of a recently established population in an atypical habitat. Occurrence of D. polita on this new host also provides insight into the host specificity and vagility of cynipid wasps.

Résumé

Le cynipe du rosier Diplolepis polita (Ashmead), parasite rencontré à ce jour exclusivement chez Rosa acicularis Lindl. à l’ouest des Rocheuses, a été trouvé pour la première fois dans des rosiers cultivés de la zone urbaine, Rosa rugosa Thunb. Dans les milieux naturels, plus de 90% des cynipes galligènes sont tués par des inquilins et des parasitoïdes. Dans les rosiers du milieu urbain, 55% des galles contiennent encore le cynipe galligène. Les différences entre les communautés associées aux galles des rosiers domestiques et celles associées aux galles des rosiers sauvages reflètent l’existence d’une population établie depuis peu dans un habitat atypique. La présence de D. polita chez ce nouvel hôte permet de comprendre un peu mieux la spécificité d’hôte et la vagilité des guêpes Cynipidae.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 6 , December 1994 , pp. 1499 - 1503
Copyright
Copyright © Entomological Society of Canada 1994

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