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Optimization of the sterilizing doses and overflooding ratios for the South American fruit fly

Author

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  • Thiago Mastrangelo
  • Adalecio Kovaleski
  • Victor Botteon
  • Wanessa Scopel
  • Maria de Lourdes Zamboni Costa

Abstract

The Sterile Insect Technique (SIT) is an autocidal control method that relies on inundative releases of sterilized mass-reared insects. This technology has been used in several area-wide programmes for the suppression/eradication of fruit fly populations. Choosing the optimum sterilizing dose and the sterile release density is an essential step of the SIT. Considering unsolved issues related to the application of this technique against Anastrepha fraterculus (Wiedemann), this study aimed to define accurately the central target dose for both sexes of this species and to verify the induction of sterility in fertile flies at different sterile:fertile ratios. The results from the regression analyses proved that the sterilization process for the A. fraterculus Brazilian-1 morphotype (the most common in southern Brazil and Argentina) could consist of irradiating pupae 72 h before adult emergence at 40 Gy, with no detrimental effects to standard quality control parameters. The ovarian development in irradiated females was characterized, demonstrating that doses equal to or higher than 25 Gy cause complete and irreversible ovarian atrophy. The laboratory and field cage tests showed that the sterility induction increased with the proportion of sterile flies, and a sterile:fertile ratio of 50:1 should be appropriate in SIT field trials. The sterile females apparently did not distract the sterile males, despite of the slightly higher reductions in pupal yield for all ratios in their absence. The data generated in this study have a great practical value and will help decision-makers in planning field trials to evaluate the efficacy of the SIT against A. fraterculus populations.

Suggested Citation

  • Thiago Mastrangelo & Adalecio Kovaleski & Victor Botteon & Wanessa Scopel & Maria de Lourdes Zamboni Costa, 2018. "Optimization of the sterilizing doses and overflooding ratios for the South American fruit fly," PLOS ONE, Public Library of Science, vol. 13(7), pages 1-17, July.
    • Handle: RePEc:plo:pone00:0201026
    DOI: 10.1371/journal.pone.0201026
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    1. Editors The, 2007. "From the Editors," Basic Income Studies, De Gruyter, vol. 2(1), pages 1-5, June.
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