Resumo

FIGUEROA-RIVERA, María Guadalupe et al. Characterization of Fusarium Species Associated with Rotting of Corn Root in Guanajuato, Mexico. Rev. mex. fitopatol [online]. 2010, vol.28, n.2, pp.124-134. ISSN 2007-8080.

The negative effects revealed in corn, such as seedlings decay to damage on the mature plant, are caused by Fusarium spp., usually causing decay on the plant organs, for instance leaves, stem and root. The present study characterized the diversity of Fusarium species associated with rotting of corn stalk in plots from the state of Guanajuato; pathogenicity tests were performed with the identified species. Plants with an evident damage caused by this pathogen were collected from 15 municipalities during 2006. The species identified in 2009, by means of microbiological tests and their pathogenicity, became evaluated as they were inoculated into thirteen race of maize accessions. The presence of F. subglutinans, F. verticillioides, F. heterosporum, F. esquiseti, F. proliferatum and F. reticulatum is revealed, being F. subglutinans the most abundant species. Concerning pathogenicity, F. verticillioides and F. subglutinans were the most pathogenic races of maize. The most tolerant race of maize was the Tuxpeño breed, and the most susceptible was the Zapalote Chico.

Palavras-chave : Pathogenicity; Fusarium esquiseti; Fusarium proliferatum; Fusarium reticulatum; Races of maize.

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