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THE EFFECT OF PARASITISM BY APHIDIUS SMITHI (HYMENOPTERA: APHIDIIDAE) ON REPRODUCTION AND POPULATION GROWTH OF THE PEA APHID (HOMOPTERA: APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

A. Campbell  and
M. Mackauer
A. Campbell
Affiliation:
Pestology Centre, Department of Biological Sciences, Simon Fraser University, Bumaby, British Columbia
M. Mackauer
Affiliation:
Pestology Centre, Department of Biological Sciences, Simon Fraser University, Bumaby, British Columbia
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Abstract

Parasitism by Aphidius smithi reduced the fecundity and population growth of pea aphid, Acyrthosiphon pisum. Aphids that were parasitized during the first or second instar period died as fourth instars without producing offspring. Parasitized third or fourth instars usually reached maturity and produced a variable number of progeny. Parasitized adult aphids stopped producing nymphs approximately 7 to 8 days following attack by A. smithi. Equations are given for the relationship between the mean total fecundity, the intrinsic rate of increase, and the doubling time of apterous and alate viviparous pea aphid and the aphid age at the beginning of parasitism.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 9 , September 1975 , pp. 919 - 926
Copyright
Copyright © Entomological Society of Canada 1975

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