Abstract

ROBLES YERENA, Leticia et al. Fusarium oxysporum Schltdl. and Fusarium solani (Mart.) Sacc. cause wilting of Pinus spp. seedlings in the nursery. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.36, pp.25-36. ISSN 2007-1132.

Conifers can suffer significant damage due to diseases in the nursery, primarily root rot and wilting of the seedlings; in Pinus spp. they are recognized as an ailment in various regions of the world. These symptoms -along with initial stages of yellowing of Pinus patula and P. pseudostrobus plants- were observed during 2013 and 2014 in a forest nursery in the state of Guerrero, Mexico. Thus, the present study was proposed, with the objective of identifying the phytopathogenic fungi associated with the problem through the morphological characterization of their asexual reproductive structures, analysis of the sequences of ITS regions of the rDNA, and pathogenicity tests, as well as of determining the incidence and severity of each of the pathogenic species of interest. Based on the seedlings of the two species of interest showing signs of damage, isolated specimens of the Fusarium genus were obtained. The morphological characterization, pathogenicity test, and analysis of sequences of ITS regions of these organisms proved that F. solani and F. oxysporum are the fungal species that cause symptoms of wilting of Pinus plants. No significant difference was observed between the incidence and the severity of the disease caused by these agents.

Keywords : Fusarium oxysporum Schltdl.; Fusarium solani (Mart.) Sacc.; incidence; pathogenicity; Pinus patula Schiede ex Schltdl. & Cham.; Pinus pseudostrobus Lindl.

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