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Comparing different methods to assess weaver ant abundance in plantation trees

Wargui Rosine, Offenberg Joachim, Sinzogan Antonio, Adandonon Appolinaire, Kossou Dansou, Vayssières Jean-François. 2015. Comparing different methods to assess weaver ant abundance in plantation trees. Asian Myrmecology, 7 : pp. 159-170.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : ENTOMOLOGY

Abstract : Weaver ants (Oecophylla spp.) are widely used as effective biological control agents. In order to optimize their use, ant abundance needs to be tracked. As several methods have been used to estimate ant abundance on plantation trees, abundances are not comparable between studies and no guideline is available on which method to apply in a particular study. This study compared four existing methods: three methods based on the number of ant trails on the main branches of a tree (called the Peng 1, Peng 2 and Offenberg index) and one method based on the number of ant nests per tree. Branch indices did not produce equal scores and cannot be compared directly. The Peng 1 index was the fastest to assess, but showed only limited seasonal fluctuations when ant abundance was high, because it approached its upper limit. The Peng 2 and Offenberg indices were lower and not close to the upper limit and therefore showed fluctuations throughout the season. The numbers of nests showed high fluctuations unlikely to reflect ant abundance, but rather reflected nest building behaviour influenced by tree phenology. In conclusion, nest counting is not recommended, whereas the Peng 1 index can track dynamics at low ant abundance and the Peng 2 and Offenberg indices can be used in most situations. (Résumé d'auteur)

Mots-clés Agrovoc : Oecophylla, Agent de lutte biologique, Lutte biologique, Mangifera indica, Anacardium occidentale, Culture fruitière, Expérimentation au champ, Densité de population

Mots-clés géographiques Agrovoc : Bénin

Classification Agris : H10 - Pests of plants
L20 - Animal ecology

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Wargui Rosine, UAC (BEN)
  • Offenberg Joachim, Aarhus University (DNK)
  • Sinzogan Antonio, UAC (BEN)
  • Adandonon Appolinaire, Université d'Agriculture de Kétou (BEN)
  • Kossou Dansou, UAC (BEN)
  • Vayssières Jean-François, CIRAD-PERSYST-UPR HortSys (BEN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/575468/)

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