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Science 11 November 2005:
Vol. 310. no. 5750, p. 992
DOI: 10.1126/science.1115871
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Brevia

Multiple Transatlantic Introductions of the Western Corn Rootworm

Nicholas Miller,1 Arnaud Estoup,2 Stefan Toepfer,3 Denis Bourguet,2 Laurent Lapchin,1 Sylvie Derridj,4 Kyung Seok Kim,5 Philippe Reynaud,6 Lorenzo Furlan,7 Thomas Guillemaud1*

The invasion of Europe by the western corn rootworm, North America's most destructive corn pest, is ongoing and represents a serious threat to European agriculture. Because this pest was initially introduced in Central Europe, it was believed that subsequent outbreaks in Western Europe originated from this area. Using model-based Bayesian analyses of the genetic variability of the western corn rootworm, we demonstrate that this belief is false: There have been at least three independent introductions from North America during the past two decades. This result raises questions about changing circumstances that have enabled a sudden burst of transatlantic introductions.

1 Biologie des Populations en Interaction, Unité Mixte de Recherche (UMR) 1112 Institute National de la Recherche Agronomique (INRA)–Université de Nice–Sophia Antipolis, 400 Route des Chappes, 06903 Sophia Antipolis Cedex, France.
2 Centre de Biologie et de Gestion des Populations, CS 30 016, 34988 Montferrier Cedex, France.
3 CABI Bioscience, Switzerland Centre Field Laboratories, c/o Plant Health Service, Rarosi ut 110, 6800 Hodmezovasarhely, Hungary.
4 Physiologie de l'insecte–Signalisation et communication, UMR 1272 INRA, Route de St Cyr, 78 026 Versailles, France.
5 U.S. Department of Agriculture, Agricultural Research Service, Corn Insects and Crop Genetics Research Unit Genetics Laboratory, Iowa State University, Ames, IA 50011, USA.
6 Laboratoire National de la Protection des Végétaux, 2 place Viala, 34060 Montpellier, France.
7 Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Agripolis, via Romea 16, 35020 Legnaro (Padova), Italy.

* To whom correspondence should be addressed. E-mail: guillem{at}antibes.inra.fr

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