Abstract
Soybean is a commodity widely cultivated in Brazil and represents one of the main export products. Several biotic and abiotic factors have limited the productivity growth of this oilseed, one of them are the nematodes associated with the monoculture. Therefore, the objective of this study was to evaluate the effect of different bioagents in control of plant-parasitic nematodes in soybean, via soil. The experiment was carried in Gurupi-TO in a randomized complete block design, with four repetitions and 14 treatments, including the witness. The treatments consisted of biocontrol agents: Paecilomyces sp., Trichoderma asperirellum, Bacillus subtilis and Pochonia sp., evaluated singly and in combinations. The treatments with Paecilomyces sp. + Bacillus subtilis and the combination of all the microorganisms results in higher averages for most traits when compared to the control treatment. The treatments Paecilomyces spp. + Bacillus subtilis and Paecilomyces sp. + Trichoderma asperellum + Bacillus subtilis + Pochonia sp., were also the most efficient in reduction of the population of nematodes evaluated. For this reason, the combination of biological control agents can reduce the population of phytonematodes.
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