Antagonismo in vitro de Fusarium oxysporum por cepas de Trichoderma spp.

Abstract

The use of agrochemicals has been a widely discussed subject, especially with regard to the conservation of the environment, as well as public health. In this regard, promising microorganisms that can be used in processes of biological control of plant diseases have been studied for a long time. The genus Trichoderma is one of the most widespread in this theme, due to its antagonistic capacity against several pathogens of crops. Among these, Fusarium oxysporum is a fungus of considerable economic importance due to its cosmopolitan character. Thus, the objective of this study was to evaluate the antagonistic capacity of four strains of Trichoderma spp. in the inhibition of the mycelial growth of F. oxysporum. Thus, the direct pairing technique was used and the percentage of inhibition of mycelial growth of the pathogen was evaluated. The experimental design was completely randomized and the data obtained were submitted to analysis of variance (p≤0.05). Therefore, it was detected that the Trichoderma strains studied are efficient in inhibiting the growth of the pathogen, presenting also the ability to overlap, conferring them as antagonists against F. oxysporum.