Abstract— The aim of this study was to attempt to identify elite inbred lines resistant to tropical rust, southern rust, gray leaf spot, northern leaf blight, physoderma brown spot and phaeosphaeria leaf spot. Fifty inbred lines were evaluated, in two seasons, in randomized blocks with 3 replications for AUDPC (Area Under the Disease Progress Curve), obtained by evaluation of the disease at 45, 60, 75 and 90 days after planting. Rating of at 1, 2, 3, 4, 5, 6, 7, 8 and 9 corresponded to 0, 1, 10, 20, 30, 40, 60, 80 and > 80% of leaf symptoms, respectively. The joint analysis of variance had significant differences between inbred lines for tropical rust, southern rust, gray leaf spot and phaeosphaeria leaf spot. There was a significant interaction between inbred lines and seasons for both tropical rust and southern rust. In season 1, tropical rust, southern rust and gray leaf spot differed significantly. In season 2, significant differences occurred for southern rust and phaeosphaeria leaf spot. We found 12 inbred lines with improved levels of resistance to tropical rust, southern rust and gray leaf spot. For phaeosphaeria leaf spot, 38 inbred lines had satisfactory resistance.
Keywords— Gray leaf spot, Northern leaf blight, Phaeosphaeria leaf spot, Physoderma brown spot, Rust.
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