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Visando ao controle químico da queima de folhas e mela de estacas de eucalipto (Eucalyptus spp.) em viveiros florestais, avaliou-se a eficiência de 12 fungicidas em inibir in vitro o crescimento micelial de um isolado epifítico de Rhizoctonia solani AG1-IB (RH-2). Sete fungicidas que inibiram totalmente o crescimento micelial do fungo, a concentrações inferiores a 100 ppm, foram pré-selecionados: methyl-tolclophos, benomyl, pencycuron, iprodione, thiabendazol, thiram e captan. Avaliou-se, ainda, a sensibilidade (EC50 = dose provável que inibe o crescimento micelial em 50%) aos fungicidas methyl-tolclophos, benomyl, iprodione e pencycuron de mais oito isolados patogênicos ao eucalipto, que diferem entre si quanto a virulência, morfologia, grupo de anastomose, número de núcleos por célula vegetativa e padrões eletroforéticos de proteínas e isoenzimas. Embora variações nos valores de EC50 entre algumas combinações de fungicidas e isolados tenham ocorrido, todos os isolados foram sensíveis aos quatro fungicidas testados (EC50 < 11 ppm). Sob condições controladas, pulverizações com iprodione (1,5 g/l), benomyl (1 g/l), methyl-tolclophos (1,5 g/l), thiram ( 2,1 g/l), captan (2 g/l) e pencycuron (2 g/l) reduziram significativamente (alfa=5%) a incidência de folhas lesionadas por R. solani AG1, em brotações de mudas envasadas. Associadas à poda de limpeza, pulverizações de brotações de eucalipto em jardim clonal (no campo) com iprodione (1 g/l) ou com mistura de benomyl (0,5 g/l) + captan (1 g/l), alternada com mistura de benomyl (0,5 g/l) + thiram (1 g/l), reduziram a incidência da mela de estacas na casa de vegetação (alfa=5%). To achieve the chemical control of leaf scorch and web blight of eucalyptus (Eucalyptus spp.) cuttings in forest nurseries, 12 fungicides were assayed against one isolate of Rhizoctonia solani AG1-IB (RH-2). Seven fungicides (methyl-tolclophos, benomyl, pencycuron, iprodione, thiabendazol and captan) completely inhibited mycelial growth under concentrations lower than 100 ppm of active ingredient on PDA culture. Additionally, the sensibility (EC50 = estimated dose for 50% inhibition of mycelial growth) to methyl-tolclophos, benomyl, pencycuron and iprodione of another eight isolates differing in virulence, morphology, anastomosis groups, and proteins and isozyme profiles was evaluated. Little differences in sensitivity was observed in some combinations of fungicides-isolates. However, the eight isolates were sensitive to the four tested fungicides (EC50 < 11 ppm). Under artificial conditions of inoculations, sprays of iprodione (1,5 g/l), benomyl (1 g/l), methyl-tolclophos (1,5 g/l), thiram (2,1 g/l), captan (2 g/l), and pencycuron (2 g/l) significantly (alpha=5%) reduced the incidence of leaf scorch on shoots of plants in vessels. Pruning of diseased shoots in clonal gardens (field) associated with weekly sprays of iprodione (1 g/l) or mixtures of benomyl (0,5 g/l) + captan (1 g/l) alternating with benomyl (0,5 g/l) + thiram (1 g/l), reduced the incidence of web blight on cuttings under shade house conditions (alpha=5%)

Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.