Resumo

TORRES P, Flor A.; ANGULO S., Víctor M.  e  REYES J., Marlene. Lambdacyhalothrin and fenitrothion resistance in a field population of Panstrongylus geniculatus (Hemiptera: Reduviidae: Triatominae). Rev. Univ. Ind. Santander. Salud [online]. 2013, vol.45, n.3, pp.19-24. ISSN 0121-0807.

Introduction: Panstrongylus geniculatus, is a wild triatomine, vector of Trypanosoma cruzy, intruder in human homes. To determine the susceptibility to insecticides commonly used in this specie is essential to detect resistant strains prematurely. Objective: This study aimed to analyze the susceptibility to lambdacyhalothrin and fenitrothion in two strains (laboratory and field) of P. geniculatus. Methodology: susceptibility was established to lambdacyhalothrin and fenitrothion by topical application in the laboratory strain - Molagavita 2003 and field population - Chorreras 2012 in first instar nymphs of P. geniculatus. Values were calculated for lethal dosis 50 and lethal dosis 99 (LD₅₀ and LD₉₉) for each insecticide. Also values were determined to degree of resistance (GR) for each insecticide: field population LD₅₀/LD₅₀ laboratory strain. Results: The LD₅₀ and LD₉₉ in the field population and the laboratory strain (in ng/i) were: 1,194, 5,764 and 0,024, 0,131 for lambdacyhalothrin and 1,476, 7,354 and 0,482, 5,471 to fenitrothion, respectively. The degrees of resistance were: GR=48.9 for lambdacyhalothrin and GR=3.06 for fenitrothion. Conclusions: The field population showed resistance to lambdacyhalothrin and fenitrothion, probably as a result of the use of chemicals in the area. Implement measures for early detection of resistance in triatomines is important in the design of vector control programs.

Palavras-chave : chagas disease; wild triatomines; P. geniculatus lambdacyhalothrin; fenitrothion; resistance.

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