Eficacia de biofungicidas para el manejo de la costra negra (Rhizoctonia solani Kühn) de la papa en Nariño, Colombia

Abstract

Abstract: This research study assessed the efficacy of biofungicides for managing the pathogenic fungus Rhizoctonia solani Kühn in potato crops at three different sites in the state of Nariño (Colombia). A randomized complete block experimental design with three replicates was performed in plots with a high incidence of rhizoctoniasis disease (black scurf). The treatments included a control (T1), Penthiopyrad chemical control (T2), Trichoderma spp. (T3), Bacillus subtilis (T4), Pseudomonas aeruginosa (T5), and the biostimulant Nointox® (T6). The results showed significant differences between treatments and the control, achieving a lower incidence of rhizoctoniasis disease during sprouting and tuberization stages. Yields were highest at the Santa Ana de Tuquerres (Nariño, Colombia) site, but this may be due to environmental factors. It is concluded that the fungicide Pentiopirad, Trichoderma spp., and Bacillus subtilis showed the most promising features for managing R. solani in potato crops.