Monitoring the susceptibility of Triatoma sordida: stål, 1859 (Hemiptera: reduviidae) populations to the insecticide deltamethrin, in the state of São Paulo, Brazil

Autores

  • Rubens Antonio da Silva Secretaria de Estado da Saúde de São Paulo, Coordenadoria de Controle de Doenças, Laboratório de Triatomíneos – Mogi Guaçu, Mogi Guaçu, São Paulo, Brazil, rubensantoniosilva@gmail.com https://orcid.org/0000-0003-1636-0652
  • Grasielle Caldas D'Ávila Pessoa Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Belo Horizonte, Minas Gerais, Brazil, grasiellepessoa2016@gmail.com https://orcid.org/0000-0001-6208-5175
  • Liléia Gonçalves Diotaiuti

DOI:

https://doi.org/10.5216/rpt.v54i4.82724

Resumo

Triatoma sordida is the most abundant triatomine species in the State of São Paulo, with wide distribution and recurrent control activities. This study aimed to analyze the susceptibility of insects to the insecticide used for control. Dilutions of deltamethrin were prepared and applied to the backs of biologically synchronized first-instar nymphs derived from 100 populations (240 insects × population) from 40 municipalities. The control group received only pure acetone. Mortality was assessed after 72 hours. The susceptibility profile observed for these populations yielded RR50 values ranging from 0.74 to 3.50. The mortality rate in response to the diagnostic dose ranged from 93.3 to 100%. The populations demonstrated susceptibility to deltamethrin, confirming the effectiveness of the insecticide for vector control activities. Continuous monitoring is recommended to promptly identify possible changes in susceptibility that may compromise control actions.

KEY WORDS: Triatomines; vectorial control; bioassays; Chagas disease.

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Publicado

2026-02-24

Como Citar

DA SILVA, Rubens Antonio; CALDAS D’ÁVILA PESSOA, Grasielle; GONÇALVES DIOTAIUTI, Liléia. Monitoring the susceptibility of Triatoma sordida: stål, 1859 (Hemiptera: reduviidae) populations to the insecticide deltamethrin, in the state of São Paulo, Brazil. Revista de Patologia Tropical / Journal of Tropical Pathology, Goiânia, v. 54, n. 4, p. 1–14, 2026. DOI: 10.5216/rpt.v54i4.82724. Disponível em: https://revistas.ufg.br/iptsp/article/view/82724. Acesso em: 24 fev. 2026.

Edição

v. 54 n. 4 (2025)

Seção

ARTIGOS ORIGINAIS / ORIGINAL ARTICLES

Licença

The manuscript submission must be accompanied by a letter signed by all authors stating their full name and email address, confirming that the manuscript or part of it has not been published or is under consideration for publication elsewhere, and agreeing to transfer copyright in all media and formats for Journal of Tropical Pathology.