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EFFECT OF HOST DISTRIBUTION ON PARASITOIDISM OF HOUSE-FLY (DIPTERA: MUSCIDAE) PUPAE BY SPALANGIA SPP. AND MUSCIDIFURAX RAPTOR (HYMENOPTERA: PTEROMALIDAE)

Published online by Cambridge University Press:  31 May 2012

Gary D. Propp  and
Philip B. Morgan
Gary D. Propp
Affiliation:
Insects Affecting Man and Animals Research Laboratory, Agricultural Research Service, USDA, PO Box 14565, Gainesville, FL 32604
Philip B. Morgan
Affiliation:
Insects Affecting Man and Animals Research Laboratory, Agricultural Research Service, USDA, PO Box 14565, Gainesville, FL 32604
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Abstract

The solitary, pupal parasitoids Spalangia spp. Muscidifurax raptor oviposited supernumerary eggs on house-fly pupae exposed at 3 poultry farms in north central Florida. The percentage total parasitoidism at the 3 sites was 23.7%, 33.6%, and 77.5%, while the percentage of the hosts containing supernumerary parasitoids was 6.2%, 10.7%, and 55.8%, respectively. The average number of parasitoids found per parasitoidized pupa ranged from 1.45 to 2.96. The parasitoids did not show a density-dependent response to spatial variation in host density. Among aggregates of hosts that contained at least 1 parasitoid, percentage total parasitoidism either decreased as host density increased or was unrelated to host density. When total parasitoidism was low, females tended to avoid already parasitoidized hosts. When total parasitoidism was high, more of the hosts contained multiple parasitoids than a single parasitoid.

Résumé

Les parasitoïdes solitaires de pupes Spalangia spp. et Muscidifurax raptor ont pondu des oeufs surnuméraires dans des pupes de mouche domestique exposées sur le site de 3 fermes du centre nord de la Floride. Le pourcentage total de parasitisme aux 3 sites était de 23,7%, 33,6% et 77,5%, et le pourcentage d'hôtes contenant des parasitoïdes surnuméraires était de 6,2%, 10,7% et 55,8%, respectivement. Le nombre moyen de parasitoïdes par pupe parasitée a varié de 1,45 à 2,96. Les parasitoïdes n'ont pas montré de réponse du type dépendante de la densité vis-à-vis la variation spatiale de la densité d'hôtes. Parmi les groupes d'hôtes contenant au moins un parasitoïde, le pourcentage total de parasitisme a baissé, ou n'était pas lié, avec la densité d'hôtes. Lorsque le parasitisme total était bas, les femelles tendaient à éviter les hôtes déjà parasités. Lorsque le parasitisme total était élevé, un plus grand nombre d'hôtes contenaient des parasitoïdes surnuméraires.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 5 , May 1985 , pp. 515 - 524
Copyright
Copyright © Entomological Society of Canada 1985

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