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Diversity and abundance of flower-visiting insects in Bt an non-Bt cotton fields of Maputaland (Kwazulu natal province, South Africa)

Hofs Jean-Luc, Schoeman A.S., Pierre J.. 2008. Diversity and abundance of flower-visiting insects in Bt an non-Bt cotton fields of Maputaland (Kwazulu natal province, South Africa). International Journal of Tropical Insect Science, 28 (4) : pp. 211-219.

Journal article ; Article de revue à comité de lecture
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Abstract : We studied the abundance and diversity of flower-visiting insects on Bt and non-Bt cotton plants in the Makhathini Flats region of South Africa during the 2003/2004 and 2004/2005 crop seasons to detect any impact of the Bt toxin (Cry1Ac). Bt cotton cultivars produced more flowers than non-Bt cultivars regardless of the cropping conditions (farmers' fields or research station), probably due to the fact that Bt cotton is not susceptible to flower bud pests. The results obtained in both crop seasons highlighted the prevalence of honeybees (Apis mellifera L.), various Nitidulidae and a unique Meloidae species (Mylabris oculata Thunberg) as flower visiting insects in this area. No impact of the Bt phenotype on insect abundance and diversity could be drawn on the basis of our comparative results on Bt and non-Bt cotton plants, and no direct effect of these transgenic plants was actually noted. The potential role of some of the inventoried insects, especially M. oculata, in the dispersal of transgenic pollen is discussed. (Résumé d'auteur)

Mots-clés Agrovoc : Gossypium, Flux de gènes, Toxine bactérienne, Bacillus thuringiensis, Impact sur l'environnement, Plante transgénique, Pollinisation, Pollinisateur, Apis mellifera, Insecta, Biodiversité

Mots-clés géographiques Agrovoc : Afrique du Sud

Mots-clés complémentaires : Mylabris, Coton Bt

Classification Agris : L20 - Animal ecology
F30 - Plant genetics and breeding
P02 - Pollution

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Hofs Jean-Luc, CIRAD-PERSYST-UPR SCA (BEL)
  • Schoeman A.S., University of Pretoria (ZAF)
  • Pierre J., INRA (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/548037/)

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