Toxic Activity of Pyrethroids in Lutzomyia longipalpis (Diptera: Psychodidae) from Magdalena River Basin, Colombia

• Published in: Acta biológica colombiana Vol. 24; no. 2; pp. 391 - 396
• Main Authors: Santamaria, Erika, Marceló-Díaz, Catalina
• Format: Journal Article
• Language: English
• Published: Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología 01.05.2019; Universidad Nacional de Colombia
• Subjects: Biological assay; BIOLOGY; Colombia; insecticides; leishmaniasis; Psychodidae; Colombia; Bioensayo; insecticidas; Psychodidae; leishmaniasis; Biological assay; insecticides
• ISSN: 0120-548X; 1900-1649
• DOI: 10.15446/abc.v24n2.74570

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 (μg/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.