Plant extracts and essential oils have been showing potential for use as acaricides. Rhipicephalus sanguineus, the brown tick, mainly parasitizes dogs is responsible pathogens transmission. The insecticidal acaricidal activity of oil (EO) Syzygium aromaticum eugenol already reported, however against R. sanguineus lacked. To evaluate S. EO larvae in vitro assays were performed using larval...