Determination of LC50 of permethrin acaricide in semi-engorged females of the tick Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae)

• Published in: Experimental parasitology Vol. 123; no. 3; pp. 269 - 272
• Main Authors: Roma, Gislaine Cristina, Oliveira, Patricia Rosa de, Pizano, Marcos Aparecido, Mathias, Maria Izabel Camargo
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.11.2009
• Subjects: adult immersion test; Arachnida; bioassays; Biological and medical sciences; engorgement; females; Fundamental and applied biological sciences. Psychology; Invertebrates; lethal dose 50; Life cycle. Host-agent relationship. Pathogenesis; Medically important nuisances and vectors, pests of stored products and materials: population survey and control; permethrin; Protozoa; Rhipicephalus sanguineus; ticks; Vectors. Intermediate hosts; Parasitiformes; Permethrin; Ticks; Pesticides; Parasite; Immersion; Acaricides; Arachnida; Acaricide; Acari; Ixodida; Arthropoda; Female; Ectoparasite; Invertebrata; Rhipicephalus sanguineus; Adult immersion test; Ixodidae
• ISSN: 0014-4894; 1090-2449
• DOI: 10.1016/j.exppara.2009.08.001

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 LC50 (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 LC50 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 LC50, 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 LC50 provides information on the potency of chemicals, the sensitivity of Arthropods to them and even estimates on pest control.