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The causes and processes of the mid-summer population crash of the potato aphids Macrosiphum euphorbiae and Myzus persicae (Hemiptera: Aphididae)

Published online by Cambridge University Press:  09 March 2007

A.J. Karley
Affiliation:
Department of Biology, University of York, Heslington, York, YO10 5YW, UK
J.W. Pitchford
Affiliation:
Department of Biology, University of York, Heslington, York, YO10 5YW, UK
A.E. Douglas
Affiliation:
Department of Biology, University of York, Heslington, York, YO10 5YW, UK
W.E. Parker
Affiliation:
ADAS Woodthorne, Wergs Road, Wolverhampton, WV6 8TQ, UK
J.J. Howardh
Affiliation:
ADAS Woodthorne, Wergs Road, Wolverhampton, WV6 8TQ, UK
Corresponding
E-mail address:

Abstract

Populations of many phloem-feeding aphid species in temperate regions increase exponentially in early summer and then ‘disappear’, usually over a time-scale of a few days, in July. To understand these dynamics, empirical investigation of the causes and modelling of the processes underlying population change are required. Numbers of the aphids Myzus persicae (Sulzer) and Macrosiphum euphorbiae (Thomas), monitored over three years in commercial potato fields in the UK, increased to a maximum of 2–2.5 per leaflet on 16 July in 1999 and 2001, and then declined to < 0.25 per leaflet by 26 July. In 2000, aphid numbers remained very low (< 0.25 per leaflet) throughout the season. The onset of the crash in aphid numbers (16–19 July in 1999 and 2001) was consistently associated with changes in the phloem amino acid composition of potato leaflets. Natural enemies, including syrphids, parasitoids, coccinellids, chrysopids and entomopathogenic fungi, increased in abundance throughout the sampling period. The incidence of winged emigrant aphids prior to the crash was low (< 10%). Experimental manipulation during 2001 demonstrated that, during the crash period, the fecundity of aphids (caged on leaves to exclude natural enemies) was depressed by 25–45% relative to earlier in the season, and that presence of natural enemies reduced aphid numbers by up to 68%. Using these data, an excitable medium model was constructed, which provided a robust description of aphid population dynamics in terms of plant development-induced changes in aphid fecundity and temporal change in natural enemy pressure.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2003

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The causes and processes of the mid-summer population crash of the potato aphids Macrosiphum euphorbiae and Myzus persicae (Hemiptera: Aphididae)
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