Ecotoxicology

, Volume 19, Issue 7, pp 1183–1192 | Cite as

Attraction of the parasitoid Cotesia marginiventris to host (Spodoptera frugiperda) frass is affected by transgenic maize

  • Nicolas Desneux
  • Ricardo Ramírez-Romero
  • Aimé H. Bokonon-Ganta
  • Julio S. Bernal
Article

Abstract

We assessed in the laboratory the attraction of the parasitoid Cotesia marginiventris (Cresson) toward odors emitted by conventional maize (Zea mays L. ssp. mays) and Bt (Bacillus thuringiensis) maize seedlings following actual or simulated injury by Spodoptera frugiperda (Smith), the parasitoid’s host, and emitted by the host’s frass, produced following consumption of conventional or Bt maize seedlings. Females of C. marginiventris exhibited similarly strong responses to conventional and Bt maize seedlings injured by the host or with simulated injury, and these were stronger than responses to clean air. In contrast, the responses of C. marginiventris females were consistently weaker toward host frass derived from Bt maize tissue compared to frass derived from conventional maize tissue. We hypothesized that the weakened response was due to a detrimental effect of Bt endotoxins, present in the Bt maize tissue, on the bacterial community present in the host’s gut and frass, including bacteria that produce odors attractive to C. marginiventris. As an initial test of our hypothesis, we compared between the responses of C. marginiventris females to host frass produced following consumption of Bt maize and frass produced from conventional maize which had been treated with an antibiotic (tetracycline) to eliminate host gut bacteria. Our results showed that C. marginiventris females responded similarly weakly to host frass derived from conventional maize tissue treated with antibiotic and to frass derived from Bt maize tissue, treated or untreated with antibiotic, while they responded strongly to frass derived from conventional maize untreated with antibiotic, so provided initial, partial support for our hypothesis. We discussed the weakened response of C. marginiventris females to host frass derived from Bt maize in the context of plausible impacts of transgenic crop cultivars on parasitoid foraging and populations, and the implications for biological control of non-target, polyphagous pests, such as S. frugiperda.

Keywords

Bacillus thuringiensis Bt Spodoptera frugiperda Biological control Kairomones Sublethal effects Non-target effects 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Nicolas Desneux
    • 1
  • Ricardo Ramírez-Romero
    • 2
  • Aimé H. Bokonon-Ganta
    • 3
  • Julio S. Bernal
    • 4
  1. 1.Unité de Recherches Intégrées en Horticulture, INRASophia-AntipolisFrance
  2. 2.Departamento de Botánica y Zoología, CUCBAUniversidad de GuadalajaraZapopanMexico
  3. 3.Direction de l’agriculture, Service de Protection des VégétauxPorto-NovoBenin
  4. 4.Biological Control Laboratory, Department of Entomology, MS 2475Texas A&M UniversityCollege StationUSA

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