Artículos de revistas
Chemical composition and fumigant effect of essentialoil of Lippia sidoides Cham. and monoterpenes against Tenebrio molitor (L.) (coleoptera: tenebrionidae)
Fecha
2011-07-01Registro en:
Ciência e Agrotecnologia. Lavras: Universidade Federal de Lavras (UFLA), v. 35, n. 4, p. 664-671, 2011.
1413-7054
10.1590/S1413-70542011000400004
S1413-70542011000400004
WOS:000294503100004
S1413-70542011000400004.pdf
Autor
Universidade Federal de São João del-Rei (UFSJ)
Universidade Federal de Lavras (UFLA)
Universidade Estadual Paulista (Unesp)
Universidade Federal de Minas Gerais (UFMG)
Institución
Resumen
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.