SciELO - Scientific Electronic Library Online

vol.32 número6Atividade antifúngica de extratos de alho e capim-santo sobre o desenvolvimento de Fusarium proliferatum isolado de grãos de milhoCaracterização de isolados de Acidovorax avenae subsp. citrulli índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados


Fitopatologia Brasileira

versão impressa ISSN 0100-4158versão On-line ISSN 1678-4677


BRITO, André H. et al. Effect of gray leaf spot on yield of commercial maize hybrids. Fitopatol. bras. [online]. 2007, vol.32, n.6, pp.472-479. ISSN 0100-4158.

With the objective of quantifying the effect of gray leaf spot (Cercospora zeae-maydis) on yield of 12 commercial maize hybrids and of correlating grain yield reduction with disease severity, two experiments were performed at two sowing dates (November 11th and December 23rd, 2005) in the experimental area of the Federal University of Lavras (UFLA), Lavras, MG, Brazil. Disease control in healthy plots of all hybrids was obtained through two applications of epoxiconazol + pyraclostrobin - 37.5 + 99.75 g i.a.ha-1) at a 15-day interval. In uncontrolled plots, epidemic development started from natural inoculum present in the area. Eight evaluations of disease severity based on visual symptoms were performed at seven-day intervals from the 60th day after maize emergence, ranging from 1 (resistant) to 9 (susceptible). The area under the disease progress curve (AUDPC) was estimated and grain yield per plot was also obtained. Results of damage percentage and correlations between grain yield and damage percentage with the estimates of the AUDPC were supported by the data. Damage intensity varied according to sowing season and hybrid, with an average of 13.3%. Maize gray leaf spot reduces the corn grain yield, mainly in the late sowing season, and the use of resistant hybrids excludes the chemical control of the disease.

Palavras-chave : Zea mays; damage; disease evaluation; fungal disease.

        · resumo em Português     · texto em Português     · Português ( pdf epdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons