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Assessment of the Insecticidal Potential of Eucalyptus urograndis Essential Oil Against Rhodnius neglectus Lent (Hemiptera: Reduviidae)

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Abstract

The resistance of triatomines to pyrethroids has been reported in several Latin American countries, including Brazil, indicating the need for the development of new approaches for the control of vectors of the Chagas disease. In here, we evaluated the insecticidal potential of the essential oil of Eucalyptus urograndis (Myrtaceae) against unsexed third and fourth instars of Rhodnius neglectus Lent (Hemiptera: Reduviidae) in topical application, fumigation, surface contact, and repellency . The insecticidal activity of the essential oil tested was detected by topical application (LD50 = 0.1731 μL/insect and LD99 = 0.2948 μL/insect for 24 h), fumigation (LC50 = 0.021 mL/mL air and LC99 = 0.1525 mL/mL air for 24 h) and surface contact (LC50 = 0.7073 μL/cm2 and LC99 = 4.59 μL/cm2 for 24 h). Mortality observed after 48–72-h exposure was very high and did not allow for any adjustment of the mortality curve. In the repellency assay, an effect was observed on 80% of tested nymphs. However, no repellency was observed after 24 h of exposure. Eucalyptus urograndis essential oil has a high insecticidal and repellent potential for R. neglectus nymphs, whether serving as a molecular model for new substances or as an alternative for the control of these insects.

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Acknowledgments

The authors would like to thank the Centro de Pesquisa do Pantanal and the Fundação Manoel de Barros for their financial support; and also CAPES and CNPq for the scholarships granted to SPG and SF (PQ).

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  1. Lab de Pesquisa em Entomologia, Univ Anhanguera/Uniderp, Av. Alexandre Herculano, 1400, Jardim Veraneio, 79037-280, Campo Grande, MS, Brasil

    S P Gomes & S Favero

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  1. S P Gomes
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  2. S Favero
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Correspondence to S P Gomes.

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Edited by Eunice Galati – INPA

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Gomes, S.P., Favero, S. Assessment of the Insecticidal Potential of Eucalyptus urograndis Essential Oil Against Rhodnius neglectus Lent (Hemiptera: Reduviidae). Neotrop Entomol 42, 431–435 (2013). https://doi.org/10.1007/s13744-013-0144-2

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