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Neotropical Entomology

, Volume 42, Issue 1, pp 102–111 | Cite as

Field Evaluation of Bt Cotton Crop Impact on Nontarget Pests: Cotton Aphid and Boll Weevil

  • E R SujiiEmail author
  • P H B Togni
  • P de A Ribeiro
  • T de A Bernardes
  • P V G N Milane
  • D P Paula
  • C S S Pires
  • E M G Fontes
Pest Management

Abstract

Bt cotton plants expressing Cry1Ac protein have high specificity for the control of lepidopteran larvae. However, studies conducted in several countries have shown these plants have a differential impact on nontarget herbivores. The aim of this study was to compare the colonization rates and population abundance of the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae) and the boll weevil, Anthonomus grandis Boheman (Coleoptera: Curculionidae), in plots of Bt (Nuopal) and non-Bt cotton (Delta Opal) in an experimental field in Brasilia, DF, Brazil. No difference was observed in the preference and colonization by winged aphids to plants from the two treatments. There was no significant difference in abundance of wingless aphids or in the production of winged aphids between treatments. Apparently, the parameters that control factors such as fecundity, survival, and dispersal were similar on both Bt and non-Bt plants. Monitoring of plants for coccinellids, a specialist predator of aphids, and ants that act on the dispersal of aphids among plants showed no significant difference between Bt and non-Bt plants, supporting the inference above. Regarding the effect on boll weevil, there was also no significant difference between treatments in the total number of fruiting structures attacked in each plot, the percentage of fruiting structures attacked per plant or on the number of weevils emerging from fruits with boll weevil damage from egg-laying, when damaged fruit samples were held in the laboratory. Based on these results, we conclude that there is no impact of Bt cotton crop expressing Cry1Ac on the nontarget herbivores tested under field conditions.

Keywords

Biosafety cry toxin herbivory nontarget organism sustainable pest management 

Notes

Acknowledgments

The authors thank Marina M. Teixeira, Francisco M. Caldas, Vinicius A. Ferreira, and Adam Zeilinger for their help in data collection, Joseane Padilha da Silva for technical support in statistical analysis, and Renata Velozo Timbó for technical support in the analysis for immunodetection. CNPq is acknowledged for financial support (processes 479211/2007-8 and No. 304253/2007-3).

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Copyright information

© Sociedade Entomológica do Brasil 2012

Authors and Affiliations

  • E R Sujii
    • 1
    Email author
  • P H B Togni
    • 2
  • P de A Ribeiro
    • 3
  • T de A Bernardes
    • 4
  • P V G N Milane
    • 4
  • D P Paula
    • 1
  • C S S Pires
    • 1
  • E M G Fontes
    • 1
  1. 1.Embrapa Recursos Genéticos e Biotcnologia-CenargenBrasiliaBrasil
  2. 2.Univ Federal de ViçosaViçosaBrasil
  3. 3.Univ de BrasiliaBrasíliaBrasil
  4. 4.Centro Universitário de Brasília-UNICEUBBrasíliaBrasil

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