ABSTRACT
This study aimed to analyze the biological control of Colletotrichum musae in bananas by using Saccharomyces cerevisiae and Saccharomyces boulardii. Cells of S. cerevisiae were obtained from Fleischmann® bread yeast. Cells of S. boulardii were obtained from the drug Floratil®. A bunch of bananas collected from an organic area was used. Fruits underwent a process of asepsis and were then treated with cells of S. cerevisiae. S. boulardii and both yeasts at the concentration of 2 g L-1; after 24 hours, C. musae was inoculated in three points per fruit. To evaluate the effect of cell concentration on the treatment, the process was repeated, treating the fruits with concentrations of 0; 0.5; 1; 2; 4 and 8 g L-1 of S. cerevisiae and S. boulardii; the injured area was evaluated at every 48 hours during 14 days. The inhibition halo and the production of volatile compounds were also evaluated, in vitro, to analyze whether there is antagonism. Treatment with these yeasts reduces the disease progress and S. cerevisiae and S. boulardii exhibit greater efficiency at the concentration of 5.5 and 6.3 g L-1, respectively, leading to a reduction of 48% and 35% in the disease progress, respectively. We observed formation of inhibition halo and production of volatile compounds, indicating that these yeasts act by means of antagonism. Thus, these yeasts are potential agents for the biological control of C. musae.
Keywords
Colletotrichum musae; Saccharomyces boulardii; Saccharomyces cerevisiae
