Orientation of European corn borer first instar larvae to synthetic green leaf volatiles

Authors

  • D. Piesik,

    1.  UMR 1272 Institut National de la Recherche Agronomique/Université Pierre et Marie Curie, Physiologie de l’Insecte: Signalisation et   Communication, INRA Centre de Versailles-Grignon, Versailles Cedex, France
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    • Present address: Department of Applied Entomology, University of Technology and Life Sciences, 20 Kordeckiego St., 85-225 Bydgoszcz, Poland.

  • D. Rochat,

    1.  UMR 1272 Institut National de la Recherche Agronomique/Université Pierre et Marie Curie, Physiologie de l’Insecte: Signalisation et   Communication, INRA Centre de Versailles-Grignon, Versailles Cedex, France
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  • K. J. Delaney,

    1.  Pest Management Research Unit, Northern Plains Agricultural Research Lab, USDA-ARS, Sidney, MT, USA
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  • F. Marion-Poll

    1.  UMR 1272 Institut National de la Recherche Agronomique/Université Pierre et Marie Curie, Physiologie de l’Insecte: Signalisation et   Communication, INRA Centre de Versailles-Grignon, Versailles Cedex, France
    2.  AgroParisTech, Département Sciences de la Vie et Santé, UFR Ecologie, Adaptations et Interactions, Paris Cedex, France
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Dariusz Piesik (corresponding author), UMR 1272 Institut National de la Recherche Agronomique/Université Pierre et Marie Curie, Physiologie de l’Insecte: Signalisation et Communication, INRA Centre de Versailles-Grignon, RD 10, 78026 Versailles cedex, France. E-mail: piesik@utp.edu.pl

Abstract

European corn borer (ECB) neonate larvae are capable of orienting towards maize odours and of avoiding spinach odours. We previously reported that maize odours’ attraction was dependent on the stimulus regime. This led us to propose that maize odours could have a repellent or attractive effect depending on their concentration. In this work, we tested this hypothesis by evaluating attraction or avoidance of neonate ECB larvae to four concentrations of each of six single green leaf volatiles (GLVs); these are commonly found in maize and other plants. We found a dose-dependent effect for all of these GLVs with the exception of 1-hexyl acetate, which did not elicit any orientation behaviour over the range of concentrations tested. These five GLVs were repellent at high concentrations, while two of them were attractive at a lower concentration. These observations indicate for the first time that plant odours induce different behaviours in ECB neonate larvae depending not only on their chemical identity but also their concentration.

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