Chemical composition and fumigant effect of essentialoil of Lippia sidoides Cham. and monoterpenes against Tenebrio molitor (L.) (coleoptera: tenebrionidae)
Nenhuma Miniatura disponível
Data
2011-07-01
Autores
Lima, Rafaela Karin
Cardoso, Maria das Gracas
Moraes, Jair Campos
Carvalho, Stephan Malfitano [UNESP]
Rodrigues, Vanessa Gregorio
Lima Guimaraes, Luiz Gustavo
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Lavras (UFLA)
Resumo
The chemical composition of Lippia sidoides essential oils obtained by hydrodistillation was characterized and quantified by GC/MS and their insecticidal activity by fumigation test was assayed against Tenebrio molitor. Moreover, the toxicity of monoterpenes carvacrol, 1,8-cineol and thymol were also evaluated when applied alone or in binary (1: 1) or tertiary (1: 1: 1) mixture. The essential oil of L. sidoides has as major constituents carvacrol (31.68%), rho-cymene (19.58%), 1,8-cineole (9.26%) and gamma-terpinene (9.21%), from a 21 compounds identified, being 92.53% of total. Both compounds have insecticidal activity against T. molitor, being the degree of toxicity of carvacrol > 1,8-cineole > L. sidoides essential oil > thymol, and its respectively LC(50) at 24h were 5.53; 5.71; 8.04 and 14.71 mu L/L air. When the different mixture of carvacrol, 1,8-cineole and thymol was assayed against T. molitor, the synergism among them was observed. For the mixture of carvacrol: 1,8-cineole LC(50) was 5.34 mu L/L air; carvacrol: thymol 7.67 mu L/L air; 1,8-cineole: thymol 7.51 mu L/L air and carvacrol: 1,8-cineole: thymol 6.34 mu L/L air. Mainly, the monoterpene thymol had a synergic effect, which increased the toxicity of carvacrol and 1,8-cineole, both in binary mixture like carvacrol: thymol and 1,8-cineole: thymol.
Descrição
Palavras-chave
Alecrim pepper, Mealworm, Natural compound, Toxicity, Synergism
Como citar
Ciência e Agrotecnologia. Lavras: Universidade Federal de Lavras (UFLA), v. 35, n. 4, p. 664-671, 2011.