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Antifungal in vitro activity of essential oils of Eugenia uniflora e Psidium cattleianum against phytopathogen Thielaviopsis basicola The fungus Thielaviopsis basicola (Berk. & Br.) Ferr is responsible for large economic losses in various agricultural crops. The use of essential oils is an alternative control technique for phytopathogenic diseases. This work aimed to characterize the biochemical compounds of essential oils extracted from leaves of Eugenia uniflora L (Pitanga) and Psidium cattleianum Sabine (Araçá Vermelho) and to evaluate if increasing concentrations of these essential oils increase the inhibition of T. basicola phytopathogen growth. The characterization of the biochemical compounds occurred R e v is t a E le t r ô n ic a C ie n t íf ic a d a U E R G S 251 Cassinelli et al. | Rev. Elet. Cient. da UERGS (2019) v. 5, n. 03, p. 250-256 by GC / MS analysis in a gas chromatograph. For the in vitro test, concentrations of 0.1%, 1.0% and 1.5% of each extracted essential oil were used, being diluted in BPA medium maintaining a control treatment (absence of the essential oils). A completely randomized design with five replications was used. Plates were incubated for 19 days at 25 ° C. The evaluations were carried out by measurements of the diameters of the colonies. Growth inhibition of the fungus at concentrations of 1.0% and 1.5% was verified for both oils tested. The results obtained in this study demonstrate that shiobunone and spatulenol are the biochemical compounds with the highest concentrations in essential oil of leaves of E. uniflora, while 1.8-cineol is the biochemical compound with the highest concentration in essential oil of leaves of P. cattleianum. Furthermore, the results confirm the efficacy of the essential oils in controlling the growth of T. basicola, where increasing concentrations of these essential oils increase the inhibition of growth of this fungus.

Atividade antifúngica in vitro dos óleos essenciais Eugenia uniflora e Psidium cattleianum contra o fitopatógeno Thielaviopsis basicola.