title: Lavandula angustifolia essential oil as a novel and promising natural candidate for tick (Rhipicephalus (Boophilus) annulatus) control.
abstract: Lavandula angustifolia is a well known herbal medicine with a variety of useful properties, including its acaricidal effect. This experiment was carried out to study the bioacaricidal activity of L. angustifolia essential oil (EO) against engorged Rhipicephalus (Boophilus) annulatus (Acari; Ixodidae) females. For this purpose six serial concentrations (0.5, 1.0, 2.0, 4.0, 6.0 and 8.0% w/v) of L. angustifolia EO were used. There was considerable mortality in concentrations more than 4.0% although there were no differences between 6.0 and 8.0% in all measured criteria. The mortality rate 24 h after inoculation was 73.26 and 100% in groups treated with 4.0 and 8.0% EO, respectively. Lavender EO also reduced tick egg weight in a concentration-dependent manner. The amount of eggs produced varied from 0.12 g (at 0.5% EO) to 0.00 g (at 8.0% EO) but did not differ statistically from the control. L. angustifolia EO caused 100% failure in egg laying at 6.0 and 8.0% whereas this value in the control group was zero. A positive correlation between L. angustifolia EO concentration and tick control, assessed by relative mortality rate and egg-laying weight, was observed by the EO LC/EC(50), which, when calculated using the Probit test, was 2.76-fold higher than the control. Lavender is a promising acaricidal against R. (B.) annulatus in vitro.
authors.affiliation: Department of Pathobiology, Faculty of Veterinary Medicine and Research Institute of Zoonotic Diseases, University of Shahrekord, Shahrekord 115, Iran. Pirali-k@vet.sku.ac.ir
authors.forename: Khodadad
authors.initials: K
authors.lastname: Pirali-Kheirabadi
authors.forename: Jaime A
authors.initials: JA
authors.lastname: Teixeira da Silva
mesh_terms: D056810:Acaricides; D000818:Animals; D001681:Biological Assay; D002417:Cattle; D004305:Dose-Response Relationship, Drug; D005260:Female; D027523:Lavandula / Q000737:chemistry*; D009822:Oils, Volatile; D010938:Plant Oils; D048494:Rhipicephalus; D013983:Tick Control / Q000379:methods*; D013984:Tick Infestations / Q000469:parasitology / Q000517:prevention & control
chemical_list: D056810:Acaricides; D009822:Oils, Volatile; D010938:Plant Oils