INTERAÇÃO DE Trichoderma asperellum E Bacillus spp. UTILIZADOS NO CONTROLE BIOLÓGICO DE DOENÇAS NA SOJA

Abstract

One of the main phytosanitary problems in large cultures are plant-parasitic nematodes, which in turn are characterized by difficulty in handling and management. Therefore, biological control has become a propelling tool to control these pathogens by using biological agents. Thus, the aim of this study is to evaluate the compatibility of microorganisms, detecting the possibility of antagonistic effects, the influence on growth and synergistic performance when applied together in the culture. For this, microbiological analyzes were carried out to observe the interaction of fungus Trichoderma asperellum with bacteria Bacillus subtilis and B. methylotrophicus. It was observed that the interaction between the genera Bacillus and Trichoderma did not promote increase in the dry mass and green fresh mass of roots and in the aerial part of soybean plants, however, it was promising due to the results observed in the microbiological analysis of fungi and bacteria, especially in the evaluation carried out on the seventh day. Considering the amount of viable spores, the interaction between B. subtilis + T. asperellum showed better results than B. methylotrophicus + T. asperellum. The interaction between Bacillus and Trichoderma showed potential for use together in the biological control in soybean agriculture.