Resumo

ARANGO BEDOYA, óscar; HURTADO BENAVIDES, Andrés Mauricio; PANTOJA DAZA, Diana  e  SANTACRUZ CHAZATAR, Lorena. Antifungal activity of essential oil of Lippia origanoides H.B.K on the growth of Phytophthora infestans. Acta Agron. [online]. 2015, vol.64, n.2, pp.116-124. ISSN 0120-2812.  https://doi.org/10.15446/acag.v64n2.42964.

Phytophthora infestans is the most damaging agent for potato crops in the humid areas of the world, causing the disease known as ‘drop or late blight’. In vitro activity of an essential oil obtained from a wild oregano specie (Lippia origanoides) was investigated. Different concentrations of the essential oil (10, 50, 100, 150, 200, 250 µg/mL) and a commercial fungicide used as control were evaluated. The antifungal activity was determined based on the assessment of mycelial growth by the agar tomato dilution method. From a concentration of 150 µg/mL the patogen’s growth was completely inhibited, therefore it was considered the lethal concentration. This study showed that essential oil of wild oregano from Alto Patía region, Cauca Department, Colombia, could be a potential antifungal agent to use in P. infestans integrated control systems.

Palavras-chave : Essential oil; oregano; Lippia origanoides; antifungical activity; Phytophthora infestans.

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