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The influence of host food plants on host recognition by four aphidiine parasitoids (Hymenoptera: Braconidae)

Published online by Cambridge University Press:  10 July 2009

W. Powell  and
A.F. Wright
W. Powell*
Affiliation:
AFRC Farmland Ecology Group, Rothamsted Experimental Station, Harpenden, UK
A.F. Wright
Affiliation:
AFRC Farmland Ecology Group, Rothamsted Experimental Station, Harpenden, UK
*
W. Powell, Entomology & Nematology Department, Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ, UK.
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Abstract

The attack rate of four parasitoids against different aphid species was investigated in the absence and presence of leaves from aphid food plants. The parasitoids used, Aphidius ervi Haliday, A. rhopalosiphi De Stefani, A. picipes (Nees) and Ephedrus plagiator Nees, varied in the extent of their host ranges. The presence of plant leaves significantly influenced the attack rate of A. ervi and A. rhopalosiphi, the two parasitoids with the most restricted host ranges, but did not appear to affect attack rates by the more polyphagous A. picipes and E. plagiator. Consideration of these results together with those from previous studies on the host preferences of laboratory populations of A. ervi and A. rhopalosiphi leads to the conclusion that genotype is probably determining the responses of individual parasitoids to semiochemicals involved in host recognition. It is proposed that field populations of oligophagous aphid parasitoids consist of a mixture of specialist and generalist individuals.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 81 , Issue 4 , December 1991 , pp. 449 - 453
Copyright
Copyright © Cambridge University Press 1991

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