title: Determination of LC(50) of permethrin acaricide in semi-engorged females of the tick Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae).
abstract: Currently, the most efficient and widely used method of tick control still is the treatment with acaricides, especially permethrin (active ingredient of the Advantage, Max3, Bayer), a pyrethroid with neurotoxic action. Due to the wide use of this acaricide in the control of the tick Rhipicephalus sanguineus, this study carried out laboratorial procedures to determine the LC(50) (lethal concentration fifty) of permethrin in semi-engorged females of R. sanguineus. Based on the result of 14 dilutions of permethrin in distilled water and later Probit analysis, the LC(50) of permethrin for R. sanguineus was 2062 ppm (1549-2675 ppm). This work can be used as a protocol with other chemicals, to determinate the LC(50), basic procedure for studies of control, resistance and behavior of ticks treated with acaricides, especially the brown dog tick R. sanguineus. Also, the knowledge of the LC(50) provides information on the potency of chemicals, the sensitivity of Arthropods to them and even estimates on pest control.
authors.affiliation: Departamento de Biologia, Instituto de Biociências, UNESP, Universidade Estadual Paulista Júlio de Mesquita Filho, Rio Claro, SP, CEP 13506-900, Cx. Postal 199, Brazil.
authors.forename: Gislaine Cristina
authors.initials: GC
authors.lastname: Roma
authors.forename: Patrícia Rosa
authors.initials: PR
authors.lastname: de Oliveira
authors.forename: Marcos Aparecido
authors.initials: MA
authors.lastname: Pizano
authors.forename: Maria Izabel
authors.initials: MI
authors.lastname: Camargo Mathias
mesh_terms: D000818:Animals; D001681:Biological Assay; D005260:Female; D007306:Insecticides / Q000032:analysis; D007928:Lethal Dose 50; D026023:Permethrin / Q000032:analysis; D048508:Rhipicephalus sanguineus / Q000737:chemistry
chemical_list: D007306:Insecticides; D026023:Permethrin