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Potential of an alternative prey to disrupt predation of the generalist predator, Orius insidiosus, on the pest aphid, Aphis glycines, via short-term indirect interactions

Published online by Cambridge University Press:  10 October 2008

N. Desneux  and
R.J. O'Neil
N. Desneux*
Affiliation:
Unité de Recherches Intégrées en Horticulture, I.N.R.A., 400 Route des Chappes, 06903 Sophia-Antipolis Cedex, France Department of Entomology, Purdue University, Smith Hall, 901 W. State Street, West Lafayette, IN 47907, USA55108, USA
R.J. O'Neil
Affiliation:
Department of Entomology, Purdue University, Smith Hall, 901 W. State Street, West Lafayette, IN 47907, USA55108, USA
*
*Author for correspondence Fax: (33) 4.92.38.66.77 E-mail: nicolas.desneux@sophia.inra.fr
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Abstract

Generalist insect predators can significantly impact the dynamics of pest populations; and, using alternative prey, they can rapidly establish in disturbed agroecosystems. However, indirect interactions between prey can occur, leading to either increased or decreased predation on focal prey. The present paper demonstrates how alternative prey can disrupt predation by the hemipteran Orius insidiosus on the soybean aphid Aphis glycines via short-term indirect interactions. We used laboratory microcosms to measure the impact of the predator on the population growth of the aphid in the presence of alternative prey, soybean thrips Neohydatothrips variabilis, and we characterized the foraging behaviour of the predator to assess prey preference. We showed that O. insidiosus predation on aphids was reduced in the presence of thrips and that this positive impact on aphids increased as thrips density increased. Results from the behavioural experiment support the hypothesis of a prey preference toward thrips. When prey-pest ratio is aphid-biased, short-term apparent commensalism between prey occurs in favour of the most abundant prey (aphids) with no switching behaviour appearing in O. insidiosus. These results demonstrate that potential indirect interactions should be taken into account when considering O. insidiosus as a biocontrol agent against the soybean aphid.

Keywords

aphidindirect interactionforaging behavioursoybeanthrips
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 98 , Issue 6 , December 2008 , pp. 631 - 639
Copyright
Copyright © 2008 Cambridge University Press

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