Composition and acaricidal activity of Laurus novocanariensis and Laurus nobilis essential oils against Psoroptes cuniculi

• Autor(a) principal: Macchioni, Fabio
• Data de Publicação: 2006
• Outros Autores: Perrucci, Stefania, Cioni, Pierluigi, Morelli, Ivano, Castilho, Paula, Cecchi, Francesca
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.13/3267
• topic: Psoroptes cuniculi; Laurus nobilis; Laurus novocanariensis; Lauraceae; Acaricide; Essential oil composition; α-pinene; Sabinene; 1,8 cineole; α-terpinyl acetate; .; Faculdade de Ciências Exatas e da Engenharia

The major components of Laurus nobilis and L. novocanariensis leaf oils were identifi ed and their acaricidal activity against Psoroptes cuniculi evaluated. Monoterpenes were predominant in L. nobilis oil (91.8%), while ses quiterpenes were only 1.4%. The main components of this oil were 1,8-cineole (39.2%), α-terpinyl acetate (11.3%), sabinene (10.6%) and linalool (7.4%). The acaricidal activity of L. nobilis oil, at a concentration of 10%, led to a mortality rate of 73%; at 5% the average activity was signifi cantly reduced to 51%, while dilutions of 2.5%, 1.25% and 0.625% were ineffective. Laurus novocanariensis oil, compared to L. nobilis, was richer in sesquiterpenes; the main constituents were α-pinene (10.4%), 1,8-cineole (9.6%) and β-selinene (7.2%). After 24 h of contact, the oil of L. novocanariensis killed all the mites when used at 10% and 5% concentrations. At lower concentrations the mortality signifi cantly decreased; a dilution of 0.625% was ineffective.