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Acta Biológica Colombiana

Print version ISSN 0120-548X


SANTAMARIA, Erika  and  MARCELO, Catalina. TOXIC ACTIVITY OF PYRETHROIDS IN Lutzomyia longipalpis (DIPTERA: PSYCHODIDAE) FROM MAGDALENA RIVER BASIN, COLOMBIA. Acta biol.Colomb. [online]. 2019, vol.24, n.2, pp.391-396. ISSN 0120-548X.

The study aimed to determine the toxicity of lambda-cyhalothrin, alpha-cypermethrin, and deltamethrin in L. longipalpis, through concentration-mortality bioassays. The test here was performed following WHO guidelines, but instead of using exposure WHO recipients and impregnated papers, 250 ml Wheaton glass bottles treated with 1 ml of insecticide solution were used. Batches of ten females of L. longipalpis were exposed to five concentrations of each pyrethroid that caused between 5 and 100 % mortality in this species. After 1 h of exposure, the females were transferred to observation recipients, and mortality was recorded 24 h later. The lethal concentrations (g/ml) that killed 50 and 95 % (LC50 and LC95) of the exposed L. longipalpis females were 0.05 and 0.86 for lambda-cyhalothrin, 0.24 and 3.62 for alpha-cypermethrin and 0.53 and 4.72 for deltamethrin. Based on the LC50 obtained, lambda-cyhalothrin is the most toxic pyrethroid for L. longipalpis, followed by alpha-cypermethrin and deltamethrin. It is expected that these data may be useful in studies on the effects of sub-lethal concentrations of the three pyrethroids on the behavior of L. longipalpis and studies on the vector susceptibility to these pyrethroids.

Keywords : Biological assay; Colombia; insecticides; leishmaniasis; Psychodidae.

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