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Hymenopterous parasitoids of cranberry tipworm (Diptera: Cecidomyiidae) in British Columbia, Canada

Published online by Cambridge University Press:  09 May 2012

D.A.H. Peach ,
J.T. Huber  and
S.M. Fitzpatrick
D.A.H. Peach
Affiliation:
Faculty of Environment, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
J.T. Huber
Affiliation:
Natural Resources Canada, c/o Eastern Cereals and Oilseeds Research Centre, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
S.M. Fitzpatrick*
Affiliation:
Agriculture and Agri-Food Canada, Pacific Agri-Food Research Centre, PO Box 1000, 6947 Highway 7, Agassiz, British Columbia, Canada V0M 1A0
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Two parasitoids, identified as a species each of Aprostocetus Westwood (near Aprostocetusmarylandensis (Girault)) (Hymenoptera: Eulophidae) and Platygaster Latreille (Hymenoptera: Platygastridae), were discovered in cranberry shoots (Vaccinium macrocarpon Aiton (Ericaceae)) infested with cranberry tipworm, Dasineura oxycoccana (Johnson), on a farm in Pitt Meadows, British Columbia, Canada. Parasitoids emerged from ∼18% of collected shoots in 2009, when Aprostocetus sp. was more numerous, and in 2010, when Platygaster sp. predominated. In 2009, Aprostocetus sp. was the only parasitoid species present in May and June, and predominated until late August, when Playtgaster sp. became prevalent. In 2010, Platygaster sp. was more numerous throughout June and July; numbers of Aprostocetus sp. increased in late July and early August. The parasitoids were naturally present despite applications of the insecticide diazinon.

Résumé

Deux parasitoïdes, identifiés respectivement comme des espèces d’Aprostocetus Westwood (près d’Aprostocetus marylandensis (Girault)) (Hymenoptera: Eulophidae) et de Platygaster Latreille (Hymenoptera: Platygastridae), ont été retrouvés dans des pousses de canneberges (Vaccinium macrocarpon Aiton (Ericaceae)) infestées par la cécidomyie des atocas, Dasineura oxycoccana (Johnson), sur une ferme de Pitt Meadows, Colombie-Britannique, Canada. Des parasitoïdes ont émergé d'environ 18% des pousses prélevées en 2009 lorsque Aprostocetus sp. était plus abondant et en 2010 quand Platygaster sp. prédominait. En 2009, Aprostocetus était le seul parasitoïde présent en mai et juin et il a prédominé jusqu’à la fin août, après quoi Platygaster sp. a prévalu. En 2010, Platygaster sp. était plus abondant sur l'ensemble des mois de juin et juillet et les nombres d’Aprostocetus sp. ont augmenté en fin de juillet et au début d'août. Les parasitoïdes étaient présents naturellement malgré des applications de l'insecticide diazinon.

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 3 , 28 May 2012 , pp. 487 - 490
Copyright
Copyright © Entomological Society of Canada 2012

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