Biological control in the management of Pratylenchus brachyurus under different treatments in soybean crop

Abstract

The soybean culture has great importance for the Brazilian economy and may face biotic and abiotic barriers in its production, with nematodes being exponents in reducing the productivity of this culture. Thus, this work aimed to evaluate the effect of biological products for the control of Pratylenchus brachyurus in soybean culture. The experiment was carried out in the greenhouse and in the Phytopathology and Nematology Laboratory of University Center Católica do Tocantins. The experimental design was completely randomized, consisting of five treatments with different biological products: T1 - control (without treatment), T2 - Presence® (Bacillus subtilis and Bacillus licheniformis), T3 - Votivo Prime® (Bacillus firmus), T4 - Ecotrich® (Trichoderma harzianum) and T5 - Nemat® (Paecilomyces lilacinus) with four replications. To evaluate the efficiency of the biological control of nematodes, the soybean seeds were previously treated at the time of sowing. Seed treatment was carried out individually, adding the products according to the dosage established in the package insert. At 30 days after inoculation, characteristics, root length, plant size, number of nematodes and severity were evaluated. The products used did not affect the root length and the number of nematodes. The product T3 - Votivo Prime®, presented the best result when evaluating the plant length. The severity was lower when using some type of product for biological control.