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Dispersal of apterous aphids (Homoptera: Aphididae) from their host plant and its significance

Published online by Cambridge University Press:  10 July 2009

Chris Hodgson
Chris Hodgson*
Affiliation:
Department of Biochemistry and Biological Sciences, Wye College, UK
*
Dr C.J. Hodgson, Department of Biochemistry and Biological Sciences, Wye College (University of London), Nr Ashford, Kent, TN25 5AH, UK.
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Abstract

Dispersal of apterae from their natal plant was monitored for three aphid species (Myzus persicae (Sulzer), Brevicoryne brassicae (Linnaeus) and Megoura viciae Buckton), each on a different host plant. Some movement off the plant occurred even in the initial parental and second generations, when the plant appeared to be growing normally and when crowding was unlikely to be the cause. However, in most experiments the most marked increase in apterous dispersal coincided with a reduction or even cessation of plant growth. In nearly all the experiments this dispersal occurred when the population on the natal plant exceeded about 20 adults and their offspring per plant. The main emigrants were fourth instar apterae and prelarviposition adult apterae. The implications of this behaviour are discussed, and it is argued that apterous dispersal might be common in aphids, allowing a fuller utilization of the environment than would be likely by alate dispersal alone.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 81 , Issue 4 , December 1991 , pp. 417 - 427
Copyright
Copyright © Cambridge University Press 1991

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