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Intra-guild vs extra-guild prey: effect on predator fitness and preference of Amblyseius swirskii (Athias-Henriot) and Neoseiulus cucumeris (Oudemans) (Acari: Phytoseiidae)

Published online by Cambridge University Press:  07 May 2009

R. Buitenhuis ,
L. Shipp  and
C. Scott-Dupree
R. Buitenhuis
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, ON, N1G 2W1, Canada Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, 2585 County Rd 20, Harrow, ON, N0R 1G0, Canada
L. Shipp*
Affiliation:
Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, 2585 County Rd 20, Harrow, ON, N0R 1G0, Canada
C. Scott-Dupree
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, ON, N1G 2W1, Canada
*
*Author for correspondence Fax: 519-738-2929 E-mail: shippl@agr.gc.ca
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Abstract

The relationships between the predatory mites, Amblyseius swirskii (Athias-Henriot) and Neoseiulus cucumeris (Oudemans) (Acari: Phytoseiidae), and their prey, western flower thrips (Frankliniella occidentalis Pergande) (Thysanoptera: Thripidae), were investigated to determine the effects of predation on intra-guild or extra-guild prey and predator preference. Life history characteristics of both predatory mites were measured when fed eggs and larvae of the other predator species and compared to data obtained when the predators were fed thrips larvae. In addition, choice tests were conducted to determine if the predators had a preference for different prey or if they were indiscriminate predators. Amblyseius swirskii appears to be an important intra-guild predator of N. cucumeris juveniles because of a high predation rate and a preference for N. cucumeris juveniles over thrips. Neoseiulus cucumeris is also an intra-guild predator of A. swirskii juveniles; however, it has a lower predation rate than A. swirskii. Contrary to intra-guild predation theory, intra-guild prey was an equally good or better food source than thrips (extra-guild prey) for both predators, based on high oviposition rates and fast development times. The results of this study indicate a high potential for negative interactions between A. swirskii and N. cucumeris when used together in biological control of thrips.

Keywords

Phytoseiidaefitnessprey preferenceintra-guild interactionsextra-guild preybiological control
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 2 , April 2010 , pp. 167 - 173
Copyright
Copyright © Cambridge University Press 2009

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