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Revista Brasileira de Plantas Medicinais

versão impressa ISSN 1516-0572versão On-line ISSN 1983-084X

Resumo

FREDDO, Á.R. et al. Essential oil potential herb-luisa (Aloysia citriodora Palau) in the control of Fusarium sp. in vitro. Rev. bras. plantas med. [online]. 2016, vol.18, n.2, pp.558-562. ISSN 1516-0572.  http://dx.doi.org/10.1590/1983-084X/15_223.

This study aimed to evaluate the potential use of Aloysia citriodora essential oilisolated from beet seedlings infected with it. The study was performed by conducting two experiments evaluating the effect of the essential oil on mycelial growth and fungus conidia germination. In the first study, in a completely randomized design, the effect concentrations (0.0155%; 0.0315%; 0.0625%; 0.125%; 0.250% and 0.500%) of essential oil of A. citriodorawas evaluated on Petri® dish with a PDA cultivation medium, plus the control, with half pure PDA. Each plate was taken as a repeat, and incubated at 24°C±1°C and a photoperiod of twelve hours. The radial growth of the pathogen, when the first plate was hit by the mycelial growth of the pathogen on its edges was evaluated. In the second experiment, the same concentrations were tested under the same incubationconditions, however, on microscope slides with half PD medium. The design was used completely randomized, each microscope slide used was considered as one experimental unit. Germination of the first 2 conidia strains, viewed from the upper left to the right was evaluated24 hours after incubation, using an optical microscope. The results of the second experiment were expressed as a percentage of conidia germination. The results obtained showed that this essential oil has fungistatic and fungicidal effect on the mycelial growth and at the conidia germination of Fusarium sp., which has a greater effect with increasing concentrations.

Palavras-chave : phytopathology; medicinal plants; Verbenaceae; Beta vulgaris L..

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