Abstract

JARAMILLO VILLEGAS, Sonia; PEREZ AVENDANO, Gustavo Alberto  and  HOYOS CARVAJAL, Liliana María. MORPHOLOGIC VARIATION OF CYSTOSORUS OF Spongospora subterranea  (Wallr.) Lagerh  f. sp. subterranea. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.2, pp.4511-4517. ISSN 0304-2847.

Powdery scab caused by Spongospora subterranea f. sp. subterranea is one of the main pathogens on potato, by losses that cause to produce galls on roots and/or pustules tuber, turning the product no apt to market, beside its high survival underground per prolonged periods of time on soil. The study of variability of S. subterranea is incipient and not yet well understood, neither its biology and methods of control in field. In the following observations morphologic characteristics of some populations of a mixture of cystosorus taken from pustules of tuber or root galls infected with S. subterranea f. sp. subterranea from Cundinamarca, Antioquia, Boyacá and Nariño, main producing zones of potato in Colombia, and were performed comparisons with the observations of other authors in Europe and Asia. These assessments were carried out by means of the measurements of cystosorus of the pathogen with light and electronic microscopy. The results allowed to determine the ranks of size of the Colombian populations, which that are between 20 and 45 µm, indifferently of their geographic origin, but with so minor size for those from root galls compared with cystosorus from tuber. Both presented minor dimension that the reported by other authors for Europe and Asia. Details of ornamentation and morphology of Colombian populations, differ from the European populations, suggesting some degree of difference or variability between the populations of these localities.

Keywords : Quistosoros; scabies dusty; zoosporas; tubers.

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