Biocontrole no manejo de Colletotrichum lindemuthianum no feijão comum

Abstract

In recent years, biological products have gained prominence, mainly because they provide a lower environmental impact in disease control. Among the biocontrol agents available on the market, bacteria of the genus Bacillus stand out for their diverse mechanisms of action, and can be used in disease resistance management in several crops. Thus, the objective of this study was to evaluate the inhibition potential of commercial products based on bacteria of the genus Bacillus on the establishment of races 65 and 73 of C. lindemuthianum, which causes anthracnose in common beans. For this purpose, four screening tests were performed in the laboratory with the purpose of selecting products with fungicidal potential: volatile and liquid metabolites test, pairing and germination inhibition. Then, the selected products were tested in a greenhouse, in 15 treatments with five replicates in a randomized block design (RBD), using the mixed inoculum of the races, in three common bean cultivars with different levels of susceptibility to the pathogen. The data obtained were subjected to analysis of variance, with the means compared by the Tukey test at 5% probability, using the R-Studio statistical program. The results obtained demonstrated the potential for in vitro inhibition of races 65 and 73 of C. lindemuthianum, by biological products based on Bacillus, presenting superior or similar results to the chemical fungicide based on bixafen + prothioconazole + trifloxystrobin. The product CCTB04 + CCTB09 + CCTB05 demonstrated greater inhibition performance for both races, with inhibition values ​​of up to 63,11% for race 65 and 76,54% for race 73. It was found that further studies are needed related to the efficiency of these biocontrol agents under in vivo conditions against the causal agent of anthracnose in common beans. Keywords: Anthracnose; Integrated management; Bean plant; Biological control; Bacillus sp.