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OCCURRENCE OF TWO GALL WASPS OF THE GENUS DIPLOLEPIS (HYMENOPTERA: CYNIPIDAE) ON THE DOMESTIC SHRUB ROSE, ROSA RUGOSA THUNB. (ROSACEAE)

Published online by Cambridge University Press:  31 May 2012

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

Abstract

Stem galls of Diplolepis spinosa (Ashmead), usually found on the endemic rose Rosa blanda Ait., and root galls of D. radicum (Osten Sacken), usually found on the endemic rose R. acicularis Lindl., have become established on the cultivated rose R. rugosa Thunb. in Canada. Adults and galls of D. spinosa and D. radicum are described and compared with those of closely related species. Host records, damage, and distribution of both species are discussed as is the suitability of R. rugosa as a host. It is suggested that galls in urban habitats are being established by adults flying into cities from surrounding patches of endemic roses.

Résumé

Des galles de la tige causées par Diplolepis spinosa (Ashmead), normalement présentes sur le rosier sauvage Rosa blanda Ait. et des galles de la racine causées par D. radicum (Osten Sacken), normalement sur le rosier sauvage R. acicularis Lindl., ont été observées sur le rosier cuiltivé R. rugosa. Thunb. au Canada. On décrit les adultes et les galles de D. spinosa et D. radicum, et on les compare à des espèces proches parentes. On discute des hôtes, des dommages et de la répartition des deux espèces, de même que de la convenance de R. rugosa comme hôte. On croit que les galles s’établissent dans les milieux urbains par la migration des adultes dans les villes à partir de colonies de rosiers sauvages.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1988

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