Resumen

MONTALVAN DELGADO, Joaquín et al. Evaluation of sugarcane brown rust resistance in Cuba. Ctro. Agr. [online]. 2018, vol.45, n.2, pp. 47-54. ISSN 0253-5785.

ABSTRACT In Cuba, the methodology used for the evaluation of resistance to sugarcane brown rust (Puccinia melanocephala Sydow and P. Sydow) lacks quantitative aspects, as well as the definition of representative localities for resistance tests and has limited patterning. In order to establish new evaluation criteria that contribute to the improvement of the Evaluative System of the Resistance to the brown rust in the Program of Improvement of the Sugar Cane in Cuba, during the 2007 - 2015, six patterns of known reaction and 11 commercial cultivars were study in 6 localities. The variables length, quantity and percentage of leaf area occupied by pustules and length of the major pustule were recorded. The six localities of resistance test were ratified and the evaluations must be carried out in the middle third of the leave +3 of ten plants at three and five months of age, with an evaluation scale with new quantitative criteria (area occupied by pustules and length of the major pustule). Cultivars SP70-1284, C88-380 and C323-68 are included as standards. C334-64, Ja60-5 and B4362 are reclassified. The methodology for evaluating the brown rust of sugarcane in Cuba is modified and a new scale of evaluation of the disease is proposed

Palabras clave : affected area; pustule; Puccinia melanocephala; resistance; Sacharum spp.

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