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The average inhibitory concentration (CI50) and average lethal concentration (CL50) of oil obtained from the seeds of Carapa guianensis aubl were determined on oviposition and larval viability of Rhipicephalus (Boophilus) microplus (Canestrini, 1887), Anocentor nitens (Neumann, 1897) and Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae). For the oviposition treatment, 10 engorged females were used at 5 different dilutions (20%, 10%, 5%, 2.5% and 1.25%). The control group of females was immersed in distilled water. Three replicates were used for each dilution. For the larval viability treatment 100 larvae ranging from 14 to 21 days of age were used at 6 dilutions (20%, 10%, 5%, 2.5%, 1.25 and 0.75%), using deionized water and Tween 80 as a dispersant. Two control groups were used, one with deionized water only and another with Tween 80 and deionized water. CI50 of 4.332, 4.850, 4.903 and CL50 of 5,228; 5,362 and 5,698 R. (B.) microplus, A. nitens and R. sanguineus were observed for oviposition and larvae respectively. The lowest concentration at which maximum effectiveness of C. guianensis oil was obtained was 10%. In conclusion this oil is toxic for these ticks and may be an alternative acaricide for tick control.

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Cálculo da CI50 (concentração inibitória média) e CL50 (concentração letal média) do óleo da semente de andiroba (Carapa guianensis, Aubl.) sobre Rhipicephalus (Boophilus) microplus (Canestrini, 1887), Anocentor nitens (Neumann, 1897) e Rhipicephalus sanguineus (Latreille, 1806) (Acari: Ixodidae)