Avaliação do potencial de óleos essenciais, de seus componentes majoritários e derivados semissintéticos no controle da antracnose em videiras

Abstract

Anthracnose is caused by the fungus Sphaceloma ampelinum De Bary anamorph of Elsinoe ampellina (De Bary) Schear. Anthracnose is one of the main vine diseases, occurring in leaves, branch and fruit. In case of severe occurrences can fully commit to production as well as impair the production of the next harvest. This work aimed to evaluate the in vitro antifungal activity of essential oils of Cymbopogon Nardus (L.) Rendle, flowers and leaves Tagetes minuta Linn, the major components of these essential oils and also of its semisynthetic derivatives mycelial growth S. ampelinum. The evaluation of the antifungal activity was accomplished in the Laboratory of Microbiology and Parasitology at Federal University of Pampa, Campus Dom Pedrito, RS. In vitro bioassays were conducted in order to verify the inhibitory effect of treatments against the mycelial growth of the pathogen. The results demonstrated that all the treatments reduced the mycelial growth of S. ampelinum, but the essential oil of Cymbopogon Nardus and its modified constituent (R,S)-Nbutylcitronellylamine showed antifungal activity by inhibiting 100 % mycelial growth in doses up to 5 μL. Although it was possible to evaluate the antifungal activity of the isomer (R)-N-butylcitronellylamine that in 10 µL dose inhibited 100 % mycelial growth in all evaluated days.