Avaliação do efeito de resíduo de uva e Pochonia chlamydosporia no manejo de rizoctoniose na cultura da beterraba

Abstract

Seedling damping-off, caused by the fungus Rhizoctonia solani, is one of the main limitations to healthy sugar beet (Beta vulgaris L.) cultivation, significantly reducing seedling emergence and vigor. This study aimed to evaluate the effectiveness of the fungus Pochonia chlamydosporia and grape residue, alone and in combination, in managing rhizoctonia leaf spot under controlled greenhouse conditions. Five treatments were tested: control, P. chlamydosporia, grape residue, grape residue + P. chlamydosporia applied simultaneously, and grape residue + P. chlamydosporia applied five days apart. The experimental design was completely randomized, with eight replicates per treatment. The results showed that the combined treatments promoted greater colonization of the beneficial fungus in the soil and significantly reduced damping-off symptoms in seedlings. Furthermore, increased plant emergence and development were observed, indicating potential synergy between the antagonistic fungus and the phenolic compounds in wine residue. These findings reinforce the potential of using agroindustrial residues combined with biological agents as a sustainable and efficient strategy for managing soil pathogens.