Monitoring the susceptibility of Triatoma sordida: stål, 1859 (Hemiptera: reduviidae) populations to the insecticide deltamethrin, in the state of São Paulo, Brazil
DOI:
https://doi.org/10.5216/rpt.v55i1.82724Resumo
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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