Evaluación del efecto de Bacillus thuringiensis sobre el desarrollo de Rhizoctonia spp. en condiciones in vitro.

Abstract

The present study was carried out in the Laboratory of Analysis of Soils, Water and Plants of the Faculty of Technical Education for Development of the Catholic University of Santiago de Guayaquil, where the effect of different applications of B. thuringiensis on selected tissues infected with Rhizoctonia spp was analyzed. The methodology consists of three applications of B. thuringiensis on Rhizoctonia spp., the first application was based on the dispersion of B. thuringiensis prior to the insertion of Rhizoctonia spp. in the culture medium, the second application was the spraying of B. thuringiensis on the mycelium of Rhizoctonia spp. in the culture medium and the third application consisted in a division of the culture medium in which the first half B. thuringiensis was dispersed and in the other half Rhizoctonia spp. was inserted. The variables studied in this paper were the diameter of Rhizoctonia spp mycelium. and the total number of sclerotia formed by Rhizoctonia spp., these variables were analyzed using the T test for independent samples where the results demonstrated that the different applications of B. thuringiensis inhibited the mycelial growth of Rhizoctonia spp. and the formation of sclerotia, however the application where B. thuringiensis was dispersed on the mycelium of Rhizoctonia spp., completely impeded the growth of Rhizoctonia spp mycelium and in turn the formation of sclerotia, being this an alternative of biocontrol of Rhizoctonia spp.