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BIOLOGY OF THE ROSE STEM GALLER DIPLOLEPIS NODULOSA (HYMENOPTERA: CYNIPIDAE) AND ITS ASSOCIATED COMPONENT COMMUNITY IN CENTRAL ONTARIO

Published online by Cambridge University Press:  31 May 2012

Scott E. Brooks  and
Joseph D. Shorthouse
Scott E. Brooks
Affiliation:
Department of Natural Resource Sciences, McGill University, Macdonald Campus, 21 111 Lakeshore, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
Joseph D. Shorthouse*
Affiliation:
Department of Biology, Laurentian University, Sudbury, Ontario, Canada P3E 2C6
*
1Author to whom all correspondence should he addressed.
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Abstract

Diplolepis nodulosa (Beutenmüller) induces small, monothalamous, prosoplasmic galls in stem tissues of Rosa blanda Aiton. Adults and galls are redescribed and notes on distribution, host records, morphological variation, and a comparison with related species are presented. Galls are commonly attacked by the inquiline Periclistus pirata (Osten Sacken). Data on life history and mortality of inducers and inquilines, along with seasonal variation in gall density, were obtained from a study site near Sudbury. Ontario, in 1993 and 1994. Inquilines killed 55% of the inducer population in 1993 and 65% in 1994. The abundance and density of galls fluctuated over the 2 years; however, the proportion of galls modified by inquilines remained constant. Six species of parasitoids caused an additional 17% inducer mortality. Aprostocetus sp. was the dominant parasitoid of D. nodulosa, whereas the other five species were incidental. The assemblage of parasitoids associated with galls modified by P. pirata caused 13% inquiline mortality and include seven species, of which Eurytoma spp. and Caenacis sp. were dominant. The unique aspects of the D. nodulosa gall system are discussed.

Résumé

Diplolepis nodulosa (Beutenmüller) produit de petites galles monothalames prosoplasmiques dans les tissus des tiges du rosier Rosa blanda Aiton. Les adultes et les galles sont décrits de nouveau et on trouvera ici des notes sur la répartition du cynips, sur les hôtes qu’il fréquente et sur ses variations morphologiques, ainsi qu’une comparaison avec les espèces qui lui sont apparentées. Les galles sont fréquemment envahies par l’espèce inquiline Periclistus pirata (Osten Saeken). Des données sur le cycle et sur la mortalité des galligènes et des inquilins. de même que sur la variation saisonnière de la densité des galles, ont été obtenues à un site d’étude près de Sudbury, Ontario, en 1993 et 1994. Les inquilins ont détruit 55% de la population des galligènes en 1993 et 65% en 1994. L’abondance et la densité des galles a fiuctué au cours des 2 années; cependant, la proportion de galles modifiées par les inquilins est resiée constante. Six espèces de parasitoïdes ont entraîné un 17% addilionel de mortalité des galligènes. Aprostocetus sp. s’ est avéré le parasitoïde dominant de D. nodulosa, alors que les cinq autres espèces sont des parasitoïdes occasionnels. L’association des parasitoïdes reliés aux galles déjà modifiées par P. pirata a entraîné 13% de mortalité chez les inquilins ei on y compte sept espèces, parmi lesquelles Eurytoma spp. et Caenacis sp. sont dominantes. Les aspects particuliers du système gallicole de D. nodulosa sont examinés.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 6 , December 1997 , pp. 1121 - 1140
Copyright
Copyright © Entomological Society of Canada 1997

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