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vol.39 número4QUALIDADE PÓS-COLHEITA DE ACEROLAS (Malpighia emarginata) TRATADAS COM ÁCIDO GIBERÉLICO E ARMAZENADAS SOB REFRIGERAÇÃOINCIDÊNCIA DE DOENÇAS E REDUÇÃO DE CUSTOS COM FUNGICIDAS UTILIZANDO COBERTURA PLÁSTICA EM VIDEIRA índice de autoresíndice de assuntospesquisa de artigos
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Revista Brasileira de Fruticultura

versão impressa ISSN 0100-2945versão On-line ISSN 1806-9967

Resumo

FIALHO, RÉGIS DE OLIVEIRA; PAPA, MARLI DE FÁTIMA STRADIOTO; PANOSSO, ALAN RODRIGO  e  CASSIOLATO, ANA MARIA RODRIGUES. FUNGITOXICITY OF ESSENTIAL OILS ON PLASMOPARA VITICOLA,CAUSAL AGENT OF GRAPEVINE DOWNY MILDEW. Rev. Bras. Frutic. [online]. 2017, vol.39, n.4, e-015.  Epub 09-Out-2017. ISSN 0100-2945.  http://dx.doi.org/10.1590/0100-29452017015.

This study aimed to evaluate the fungitoxic (antifungal) effect of seven essential oils on Plasmopara viticola, the causal agent of grapevine downy mildew. The cinnamon, eucalyptus globulus, marjoram, melaleuca, peppermint, oregano and white thyme essential oils were compared with the mancozeb + metalaxyl-M fungicide. Three experiments were conducted to evaluate the effect of essential oils on spore germination. The first experiment evaluated the effect of direct contact of essential oils on the pathogen; the second evaluated the effect of volatile compounds on the pathogen and the third assessed the behavior of essential oils, when applied to vine leaves in field conditions, on the pathogen. All essential oils inhibited the spores’ germination, but in varying degrees, in addition, presenting fungistatic activity. All the essential oils showed chemical instability when the incubation time or the interval between products application where increased, all oils decrease antifungal activity percentage. Noteworthy, the cinnamon and the eucalyptus globulus essential oils were the most fungitoxic (antifungal) on P. viticola.

Palavras-chave : Fungicidal activity; fungistatic activity; alternative control; spore germination.

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