Resumo

CHAVANNE, Ernesto R. et al. Productivity and disease tolerance of TUC 95-37, a new sugarcane (Saccharum spp.) variety in Tucumán, Argentina. Rev. ind. agric. Tucumán [online]. 2012, vol.89, n.1, pp.01-09. ISSN 1851-3018.

This paper reveals the results of studies conducted to evaluate the productivity and tolerance to diseases of TUC 95-37, a new sugarcane (Saccharum spp.) cultivar obtained and selected by the Sugarcane Breeding Program of Estación Experimental Agroindustrial Obispo Colombres (Tucumán, Argentina). Data in this work derived from 24 harvests in trials with 18 genotypes, planted according to a completely randomized block design with three repetitions, with replicates at six different sites in Tucumán. TUC 95-37 was assessed at four different crop ages (plant cane, first, second and third ratoons), through the 2002 and 2005 crop seasons. For each variable, age and location, the analysis of variance and comparison of means tests were performed. GGE biplot methodology was used as a graphic tool to identify superior and stable cultivars in different environments. In addition, disease resistance levels were evaluated. Productivity data (crop yield, factory yield percentage in May, and sugar production per ha) showed that TUC 95-37 was as productive as LCP 85-384 at most of the crop ages and sites considered. TUC 95-37 turned out to be the best or most productive among genotypes and a very stable variety at plant cane, also ranking as the second best variety, as well as a very stable one, at first and second ratoon ages. However, at third ratoon TUC 95-37 showed lower stability in different environments. As regards its response to diseases, this new cultivar proved to be moderately resistant to brown rust (Puccinia melanocephala), leaf scald (Xanthomonas albilineans), and smut (Sporisorium scitamineum). Nonetheless, TUC 95-37 was moderately susceptible to mosaic (Sugarcane mosaic virus) and red stripe (Acidovorax avenae) and, as most sugarcane varieties planted in other parts of the world, it presented susceptibility to ratoon stunting disease (Leifsonia xyli subsp. xyli).

Palavras-chave : New sugarcane cultivar; Production; Phenotypic stability.

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