Journal of Chemical Ecology

, Volume 32, Issue 10, pp 2191–2203 | Cite as

Structure–Activity Relationships of Benzoic Acid Derivatives as Antifeedants for the Pine Weevil, Hylobius abietis

  • C. Rikard Unelius
  • Göran Nordlander
  • Henrik Nordenhem
  • Claes Hellqvist
  • Sacha Legrand
  • Anna-Karin Borg-Karlson
Life Sciences

Abstract

Aromatic organic compounds found in the feces of the pine weevil, Hylobius abietis (L.) (Coleoptera: Curculionidae), have been shown to deter feeding behavior in this species, which is a serious pest of planted conifer seedlings in Europe. We evaluated 55 benzoic acid derivatives and a few homologs as antifeedants for H. abietis. Structure–activity relationships were identified by bioassaying related compounds obtained by rational syntheses of functional group analogs and structural isomers. We identified five main criteria of efficiency as antifeedants among the benzoic acid derivatives. By predicting optimal structures for H. abietis antifeedants, we attempted to find a commercial antifeedant to protect conifer seedlings against damage by H. abietis in regenerating forests. New, highly effective antifeedants are methyl 2,4-dimethoxybenzoate, isopropyl 2,4-dimethoxybenzoate, methyl 2-hydroxy-3-methoxybenzoate, methyl (3,5-dimethoxyphenyl)acetate, and methyl (2,5-dimethoxyphenyl)acetate. Of these, methyl 2,4-dimethoxybenzoate and isopropyl 2,4-dimethoxybenzoate have the highest antifeedant indices of all substances tested and are the best candidates for practical applications in order to protect planted seedlings in the field.

Keywords

Benzoate Bioassay Curculionidae Deterrent Feces Feeding Isopropyl 2,4-dimethoxybenzoate Methyl 2,4-dimethoxybenzoate Phenylacetate Reforestation Seedling protection 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • C. Rikard Unelius
    • 1
  • Göran Nordlander
    • 2
  • Henrik Nordenhem
    • 2
  • Claes Hellqvist
    • 2
  • Sacha Legrand
    • 1
  • Anna-Karin Borg-Karlson
    • 3
  1. 1.Department of Chemistry and Biomedical SciencesUniversity of KalmarKalmarSweden
  2. 2.Department of EntomologySwedish University of Agricultural SciencesUppsalaSweden
  3. 3.KTH Chemistry, Organic Chemistry, Ecological Chemistry GroupRoyal Institute of TechnologyStockholmSweden

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