title: The potential application of plant essential oils to control  Pediculus humanus capitis (Anoplura: Pediculidae).
abstract: The human head louse, Pediculus humanus capitis (Anoplura: Pediculidae), is an ectoparasite confined to the scalp and human hairs. The repeated use of insecticides for the control of head lice during past decades has resulted in the development of marked levels of resistance. Natural compounds such as essential oils (EOs) have been suggested as alternative sources for insect control agents. In order to introduce a new pediculicide based on EOs, the effectiveness of the product and their effects on human being must be analyzed. In consequence, the biological activity of EOs from the leaves and fruits of Schinus areira (Anacardiaceae) and the leaves of Thymus vulgaris (Lamiaceae), Aloysia polystachya and Aloysia citriodora (Verbenacea) were evaluated against the eggs and adults of P. humanus capitis by fumigant and contact toxicity bioassays. Additionally, dermal corrosion/irritation tests were performed on New Zealand albino rabbits. In a fumigant bioassay, EOs from the leaves and fruits of S. areira were the most toxic against P. humanus capitis adults while these EOs and T. vulgaris were the most effective against the eggs. In contact bioassay, the EO from T. vulgaris was the most toxic against both stages. In the corrosion/irritation tests, the EOs did not produce dermal effects. According to the results, the essential oils from the leaves of T. vulgaris would be a valid tool for the management of P. humanus capitis. This EO produces a high knockdown effect in adults (followed by mortality) and toxicity in the eggs when it is applied for 21 min at a low concentration.
authors.forename: María Mercedes
authors.initials: MM
authors.lastname: Gutiérrez
authors.forename: Jorge Omar
authors.initials: JO
authors.lastname: Werdin-González
authors.forename: Natalia
authors.initials: N
authors.lastname: Stefanazzi
authors.forename: Cristina
authors.initials: C
authors.lastname: Bras
authors.forename: Adriana Alicia
authors.initials: AA
authors.lastname: Ferrero
mesh_terms: D027926:Anacardiaceae / Q000737:chemistry; D000818:Animals; D001681:Biological Assay; D002648:Child; D002675:Child, Preschool; D005638:Fruit / Q000737:chemistry; D005651:Fumigation; D006801:Humans; D007300:Insect Control; D010373:Lice Infestations / Q000188:drug therapy / Q000469:parasitology / Q000517:prevention & control*; D009822:Oils, Volatile / Q000008:administration & dosage* / Q000633:toxicity; D010063:Ovum / Q000187:drug effects; D010374:Pediculus; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000008:administration & dosage* / Q000633:toxicity; D011817:Rabbits; D012536:Scalp Dermatoses / Q000188:drug therapy / Q000469:parasitology / Q000517:prevention & control*; D046930:Thymus Plant / Q000737:chemistry; D029648:Verbenaceae / Q000737:chemistry
chemical_list: D009822:Oils, Volatile; D010938:Plant Oils