Abstract

CARVALHO, Rejane Rodrigues da Costa e et al. In vitro activity of essential oils of Lippia sidoides and Lippia gracilis and their major chemical components against Thielaviopsis paradoxa, causal agent of stem bleeding in coconut palms. Quím. Nova [online]. 2013, vol.36, n.2, pp.241-244. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422013000200007.

Essential oils of Lippia sidoides, Lippia gracilis and their main chemical components were investigated for in vitro control of Thielaviopsis paradoxa. Mycelial growth and a number of pathogen conidia were inhibited by the essential oil of L. sidoides at all concentrations tested (0.2; 0.5; 1.0; 3.0 µL mL^-1). L. sidoides oil contained 42.33% thymol and 4.56% carvacrol, while L. gracilis oil contained 10% thymol and 41.7% carvacrol. Mycelial growth and conidial production of T. paradoxa were completely inhibited by thymol at a 0.3 µL m^-1 concentration. The results suggest that thymol could potentially be used for controlling coconut stem bleeding.

Keywords : coconut; Lippia; Thielaviopsis paradoxa.

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