Abstract

RESTREPO DUQUE, Andrés Felipe; JARAMILLO VILLEGAS, Sonia  and  COTES TORRES, José Miguel. EFECT OF TWO MICROORGANISMS, MYCORHIZE AND PINE WOOD SHAVINGS ON THE CONTROL OF POWDERY SCAB (Spongospora subterranea) IN POTATO. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.2, pp.5047-5054. ISSN 0304-2847.

The effect of two potential microorganism, mycorhize and pine wood shavings for management of Spongospora subterranea f. sp. subterranea in potato cultivar DIACOL Capiro were evaluated. This research was established at the Agricultural Center of Paysandú (Santa Elena - Medellín) to 2,550 masL, average temperature of 14 °C and average annual rainfall of 2,500 mm. A field experiment was established using a randomized complete design with four replications and five treatments (Trichoderma harzianum; Comercial product of Mycorhize "Mikorhyze lote C7"; Pseudomonas fluorescents, pine wood shavings and check without control). Were found rates of disease incidence in roots (32%) for the check treatment (without any application), although the severity of disease of both the check and another treatments were very low, which did not exceed 0.23%. The expression of symptoms in tubers showed statistically significant difference between check treatment and another treatment and the use of T. harzianum, mycorhize and P. fluorescents to tubers, like the addition of pine wood shavings on the floor. These treatments reduced the incidence and severity of powdery scab in roots and tubers. The physiological variables dry weight of roots, tubers and leaf, did not show positive increases or significant differences between treatments evaluated.

Keywords : Pseudomona; mycorhize; disease management; biocontrol.

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