Abstract

HOYOS CARVAJAL, Liliana María; JARAMILLO VILLEGAS, Sonia  and  ORDUZ PERALTA, Sergio. EVALUATION OF Trichoderma asperellum AS BIOREGULATOR OF Spongospora subterranea  f. sp. subterranea. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.2, pp.4496-4502. ISSN 0304-2847.

Powdery scab caused by Spongospora subterranea, is one of the main diseases on potato crops, is a protozoo for which exist limited control strategies because it counts with diverse types of inoculum, resistance structures and alternative hosts. The objective of this work was to test Trichoderma asperellum T-84 and T-109 against S. subterranea under controlled conditions in two experiments, evaluating in plants until nine and twelve week, variables of fresh and dry weight and number of galls produced by the pathogen. Consistently the plants with T. asperellum increased fresh weight (Experiment 1) and dry weight (Experiment 2) and reduced the number of nodules of S. subterranea in potato root, better in single applications than in mixture. This is a preliminary study that suggests T. asperellum could be a potential agent of biological regulation in the future for powdery scab, but it will be require studies of the interaction potato plant/S. subterranea/Trichoderma for its implementation.

Keywords : Powdery scab; potato; bioregulation; Trichoderma asperellum; Spongospora subterranea.

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