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Revista de la Universidad Industrial de Santander. Salud
versión impresa ISSN 0121-0807
Resumen
TORRES P, Flor A.; ANGULO S., Víctor M. y 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.
Palabras clave : chagas disease; wild triatomines; P. geniculatus lambdacyhalothrin; fenitrothion; resistance.