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Sele o de Fungicidas para Controle de Oídio em Eucalipto Selection of Fungicides for Control of Eucalypt Powdery Mildew

DOI: 10.4336/2012.pfb.51.165

Keywords: controle químico , doen a , Eucalyptus benthamii. 1

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Abstract:

O objetivo deste estudo foi encontrar fungicidas eficientes contra o oídio do eucalipto. Foram testados os fungicidas chlorothalonil (2 g/l), fenarimol (0,5 ml/l), enxofre (3 g/l), tebuconazole (1 ml/l), propiconazol 12,5% + trifloxistrobina 12,5% (0,6 ml/l), benzothiadiazol (1g/l), piraclostrobina 13,3% + epoxiconazol 5% (1ml/l) e triadimenol (1 ml/l). Os fungicidas foram pulverizados em 30 mudas por tratamento de Eucalyptus benthamii, naturalmente infectadas. A doen a foi avaliada aos 9, 16, 23, 30 e 37 dias após serem colocadas em um ambiente infectado, onde os sintomas foram classificados em uma escala de notas que variam de 0 (ausência de sintomas) a 4 (sintoma muito forte). Os melhores tratamentos foram piraclostrobina + epoxiconazol, propiconazol + trifloxistrobina e triadimenol, apresentando um índice médio de infec o de 0,39 e 0,63 e 1,01, respectivamente. The objective of this study was to find effective fungicides against eucalypt powdery mildew. Fungicides tested were chlorothalonil, fenarimol, sulfur, tebuconazole, propiconazole, benzothiazole, pyraclostrobin + epoxiconazole and triadimenol. These fungicides were sprayed on Eucalyptus benthamii seedlings in a greenhouse infested with powdery mildew. Severity was evaluated at 9, 16, 23, 30 and 37 days after spraying, classifying symptoms observed with a scale 0 (symptoms absent) to 4 (strong symptoms). Best treatments were obtained with pyraclostrobin + epoxiconazole, propiconazole + trifloxystrobin and triadimenol, with an infection index average of 0.39, 0.63 and 1.01, respectively.

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