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PARASITOIDS REARED FROM THE OBLIQUEBANDED LEAFROLLER (LEPIDOPTERA: TORTRICIDAE) INFESTING RASPBERRIES

Published online by Cambridge University Press:  31 May 2012

S.Y. Li ,
S.M. Fitzpatrick ,
J.T. Troubridge ,
M.J. Sharkey ,
J.R. Barron  and
J.E. O’Hara
S.Y. Li*
Affiliation:
Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, P.O. Box 960, University Drive, Corner Brook, Newfoundland, Canada A2H 6J3
S.M. Fitzpatrick
Affiliation:
Pacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, 6947 No. 7 Highway, P.O. Box 1000, Agassiz, British Columbia, Canada VOM 1AO
J.T. Troubridge
Affiliation:
Pacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, 6947 No. 7 Highway, P.O. Box 1000, Agassiz, British Columbia, Canada VOM 1AO
M.J. Sharkey
Affiliation:
Department of Entomology, College of Agriculture, University of Kentucky, Lexington, Kentucky, United States 40546-0091
J.R. Barron
Affiliation:
Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada KlA OC6
J.E. O’Hara
Affiliation:
Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada KlA OC6
*
1Author to whom all correspondence should be addressed.
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Abstract

Fourteen species of parasitoids (13 hymenopterans, 1 dipteran) were reared from larvae or pupae of the obliquebanded leafroller, Choristoneura rosaceana (Harris), collected from commercial raspberry fields in the Fraser Valley, British Columbia, Canada, over 3 years. Levels of parasitism ranged from 5 to 15%. Among these 14 species, five represent new host records. A polyembryonic wasp, Macrocentrus nigridorsis Viereck (Hymenoptera: Braconidae), was the most abundant parasitoid. External feeding on the final host instar is obligatory for M. nigridorsis to complete development. On average, each parasitized host larva produced about 36 M. nigridorsis, in either unisexual or mixed-gender groups. Overall male to female sex ratio was 1:4. Head capsules of mature parasitized host larvae were significantly larger than those of unparasitized ones, suggesting that C. rosaceana larvae parasitized by M. nigridorsis might have an extra larval stage.

Résumé

Quatorze espèces de parasitoïdes (13 hyménoptères, 1 diptère) ont été élevées à partir de larves ou de nymphes de la Tordeuse à bandes obliques, Choristoneura rosaceana (Harris), recueillies dans des champs commerciaux de framboisiers dans la vallée du Fraser, Colombie-Britannique, Canada, au cours d’une période de 3 ans. Le degré de parasitisme allait de 5 à 15%. Parmi les 14 espèces, cinq représentaient des relations hôte–parasite encore inédites. Une guêpe polyembryonnaire, Macrocentrus nigridorsis Viereck (Hymenoptera : Braconidae), s’est avérée le parasitoïde le plus abondant. Pour compléter son développement, M. nigridorsis doit se nourrir obligatoirement à même la larve de stade terminal de son hôte, par l’extérieur. En moyenne, chaque larve hôte parasitée a produit environ 36 M. nigridorsis, en groupes d’individus du même sexe ou en groupes de mâles et de femelles. Dans l’ensemble, le rapport mâles à femelles était de 1,4. Chez les larves parasitées à maturité, la capsule céphalique était significativement plus grosse que chez les larves non parasitées, ce qui semble indiquer que les larves de C. rosaceana parasitées par M. nigridorsis comptent peut-être un stade larvaire additionnel.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 131 , Issue 3 , June 1999 , pp. 399 - 404
Copyright
Copyright © Entomological Society of Canada 1999

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