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POPULATION DYNAMICS AND RECOGNITION OF BIOTYPES IN THE PEA APHID (HOMOPTERA: APHIDIDAE)

Published online by Cambridge University Press:  31 May 2012

B. D. Frazer
B. D. Frazer
Affiliation:
Research Station, Canada Department of Agriculture, Vancouver, B.C.
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Abstract

Five biotypes of the pea aphid, Acyrthosiphon pisum (Harris), from four hosts were recognized by their differential survival and rates of population increase on broom, white clover, alfalfa and broad beans, by body size, colour, and rates of natural increase (rm) on broad beans. A simple method is described which can verify that the differences between rm values measured by life table analysis are not due to chance.

Four of the biotypes were sympatric. It is suggested that biotypes in the pea aphid result from annual adaptations to various species of leguminous host plants and therefore other characteristics of the biotypes may vary from year to year. For this reason, only fundatrices and their immediate offspring which have not been subjected to this selection should be used as test organisms in assaying plants for resistance to pea aphids. The use of a biotype of a single year for screening plant varieties may lead to the production of varieties which are highly acceptable to other biotypes.

Type
Articles
Information
The Canadian Entomologist , Volume 104 , Issue 11 , November 1972 , pp. 1729 - 1733
Copyright
Copyright © Entomological Society of Canada 1972

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