Bacterial antagonistic activity in vitro did not biocontrol the mycelial growth of fungus Fusarium oxysporum f. sp. Passiflorae

Abstract

The objective of this work was to evaluate the in vitro antagonistic action of bacterial isolates in the biocontrol of passion fruit fusariosis. Thus, the use of bacterial isolates can be an important agroecological tool for the control of phytopathogens, reducing the use of chemical products and making the use of microorganisms more and more common. The evaluation occurred by evaluating the percentage inhibition of mycelial growth was calculated by the formula (P.I.C.). All the bacterial isolates tested (B276, B275, B295, B297) demonstrated significant antagonistic effect on the mycelial growth of F. oxy. f. sp. passiflorae when compared to the control. In the last evaluation, it was observed that only the bacterial isolate MGSS B276 was able to completely inhibit the pathogen, not observing growth, MGSS B275, B295 and B279 isolates showed an average growth of 3.04cm, 2.45cm and 0.16cm differing of the control that obtained a constant and continuous growth until the entire filling of the plate 9,0cm.