title: Acaricidal efficacy of Origanum onites L. essential oil against Rhipicephalus turanicus (Ixodidae).
abstract: Essential oils that were extracted by steam distillation from Origanum onites L. from northwest Turkey were analyzed using an Agilent GC-MSD system. Carvacrol was the major component (64.3%) of the oil. Both pure commercial carvacrol and essential oil at concentrations of 1.5%, 3.2%, 6.25%, 12.5%, 25%, 50%, and 100% (v/v) were tested for their effects against engorging Rhipicephalus turanicus, which were collected from cattle breeding in the region. Pure carvacrol killed all the ticks following 6 h of exposure, while 25% and higher concentrations of the oil were completely effective in killing the ticks by the 24th-hour post-treatment (p < 0.05). The concentrations of 6.25% and 12.5% killed all the ticks by day 2. Lethal concentrations for 50% (LC(50)) and 90% (LC(90)) of 2.34% and 7.12%, respectively, were detected 24 h post-treatment. These findings indicate that the essential oil of O. onites L. has potential to be utilized at reasonable concentrations to control tick infestations.
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, University of Uludag, Görükle, Bursa, 16059, Turkey. scoskun@uludag.edu.tr
authors.forename: Sevki
authors.initials: S
authors.lastname: Coskun
authors.forename: Oya
authors.initials: O
authors.lastname: Girisgin
authors.forename: Mine
authors.initials: M
authors.lastname: Kürkcüoglu
authors.forename: Hulusi
authors.initials: H
authors.lastname: Malyer
authors.forename: Ahmet Onur
authors.initials: AO
authors.lastname: Girisgin
authors.forename: Nese
authors.initials: N
authors.lastname: Kirimer
authors.forename: Kemal Hüsnü
authors.initials: KH
authors.lastname: Baser
mesh_terms: D000818:Animals; D005260:Female; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D008297:Male; D009822:Oils, Volatile / Q000737:chemistry / Q000494:pharmacology*; D031341:Origanum / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry / Q000494:pharmacology*; D048494:Rhipicephalus / Q000187:drug effects* / Q000254:growth & development; D014421:Turkey
chemical_list: D007306:Insecticides; D009822:Oils, Volatile; D010938:Plant Oils