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- The objectives of this study were to identify maize hybrids which have high grain yield and resistance to Phaeosphaeria leaf spot, gray leaf spot and common rust, as well as to estimate the most efficient period for measuring the reaction of the hybrids to the pathogens. Two experiments were set up in Lavras, MG, Brazil, assessing 30 hybrids in the season of 2011/2012. The experimental design was a 6 x 5 lattice arrangement with three replications. Grain yield was evaluated and five assessments of disease severity were performed at ten-day intervals as of 60 days after maize emergence. After that, the area under the disease progress curve (AUDPC) and the Spearman correlations between the diseases and the various assessment periods for each disease were estimated. It was found that the hybrids GNZ9626 PRO and GNZ9501 PRO have high grain yield and a satisfactory level of resistance to Phaeosphaeria leaf spot, gray leaf and common rust, and that assessment of the level of resistance to these diseases should be performed in the period from 80 to 100 days after plant emergence, which provides results similar to AUDPC. Keywords: Zea mays L., Leaf diseases, Genetic resistance. AVALIACAO DE HIBRIDOS DE MILHO A MANCHA BRANCA, CERCOSPORIOSE E FERRUGEM COMUM E A PRODUTIVIDADE RESUMO - Os objetivos deste trabalho foram identificar hibridos de milho que apresentem alta produtividade de graos e resistencia a mancha-branca, cercosporiose e ferrugem comum, bem como estimar a epoca de avaliacao mais eficiente para mensurar a reacao dos hibridos aos patogenos causadores dessas doencas. Para isso, foram instalados dois experimentos no municipio de Lavras, MG e avaliados 30 hibridos no ano agricola de 2011/2012. O delineamento experimental utilizado foi o latice 6 x 5 com tres repeticoes. Foi avaliada a produtividade de graos e realizadas cinco avaliacoes da severidade dessas enfermidades, em intervalos de 10 dias, a partir de 60 dias da emergencia das plantas. Posteriormente, estimou-se a area abaixo da curva de progresso das doencas (AACPD) e a correlacao de Sperman entre as mesmas com as diversas epocas de avaliacao de cada doenca. Constatou-se que os hibridos GNZ9501 PRO e GNZ9626 PRO apresentam alta produtividade de graos e satisfatorio nivel de resistencia a mancha-branca, cercosporiose e ferrugem comum e que para a avaliacao do nivel de resistencia a essas enfermidades deve-se optar pela avaliacao no periodo que compreende 80 a 100 dias apos a emergencia das plantas, o qual fornece resultados semelhantes a AACPD. Palavras-chave: Zea mays L., Doencas foliares, Resistencia genetica.

EVALUATION OF MAIZE HYBRIDS TOLERANT TO PHAEOSPHAERIA LEAF SPOT, GRAY LEAF SPOT AND COMMON RUST AND YIELD