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OPIINE PARASITOIDS (HYMENOPTERA: BRACONIDAE) OF RHAGOLETIS POMONELLA AND R. ZEPHYRIA (DIPTERA: TEPHRITIDAE) IN THE WILLAMETTE VALLEY, OREGON1

Published online by Cambridge University Press:  31 May 2012

M. T. AliNiazee
M. T. AliNiazee
Affiliation:
Department of Entomology, Oregon State University, Corvallis 97331
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Abstract

Two species of opiine (Braconidae) parasitoids, Opius lectoides Gahan and O. downesi Gahan parasitized Rhagoletis zephyria Snow and R. pomonella (Walsh) in the Willamette Valley, OR. Almost equal numbers of O. lectoides and O. downesi were recorded from R. zephyria, whereas about 91% of the opiines associated with R. pomonella were O. downesi. In general, percent parasitization of R. pomonella was variable from sample to sample, but substantially higher on hawthorn than on apple fruit. It appears that both the opiine species have made a rapid host shift from R. zephyria to newly introduced populations of R. pomonella.

Résumé

Deux espèces d'opiines (Braconidae), Opius lectoides Gahan et O. downesi Gahan ont été trouvées parasitant Rhagoletis zephyria Snow et R. pomonella (Walsh) dans la Vallée de Willamette en Oregon. Des nombres à peu près égaux de O. lectoides et de O. downesi ont été trouvés sur R. zephyria alors que 91% des opiines associés à R. pomonella étaient des O. downesi. En général le pourcentage de parasitisme de R. pomonella était variable d'un échantillon à l'autre, mais significativement plus élevé sur l'aubépine que sur le pommier. Il semble que ces deux opiines ont effectué un transfert rapide d'hôte, passant de R. zephyria aux populations nouvellement établies de R. pomonella.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 2 , February 1985 , pp. 163 - 166
Copyright
Copyright © Entomological Society of Canada 1985

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