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FECUNDITY AND HOST UTILIZATION OF THE APHID PARASITE APHELINUS SEMIFLAVUS (HYMENOPTERA: APHELINIDAE) AT TWO HOST DENSITIES

Published online by Cambridge University Press:  31 May 2012

Manfred Mackauer
Manfred Mackauer
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6
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Abstract

The longevity, fecundity, and oviposition rates of Aphelinus semiflavus Howard were determined at densities of 20 and 60 pea aphid hosts per day. Host density had no significant effect on parasite longevity and total fecundity, but it did influence the mean daily oviposition rate (16.5 and 19.5 aphids/day at density 20 and 60, respectively) and the overall proportion of aphids parasitized (82.3% and 32.5%, respectively) during the period of maximum egg laying. The implications of a shift in the fecundity schedule to an earlier reproductive age are discussed.

Résumé

La longévité, la fécondité et la vitesse de ponte ont été mesurées chez Aphelinus semiflavus Howard aux densités de 20 et 60 hôtes (puceron du pois) par jour. La densité de l'hôte n'a pas affecté la longévité et la fécondité totale de façon significative, mais a influencé la vitesse journalière moyenne de ponte (16.5 et 19.5 pucerons/jour aux densité de 20 et 60, respectivement), et la proportion globale de pucerons parasités (82.3% et 32.5%, respectivement) au cours de la période de ponte maximale. Les implications d'un déplacement temporel du patron de fécondité vers un âge reproducteur plus précoce sont commentées dans la discussion.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 8 , August 1982 , pp. 721 - 726
Copyright
Copyright © Entomological Society of Canada 1982

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