ASSOCIAÇÃO DE MÉTODO DE CONTROLE PARA O MANEJO DE FITONEMATOIDES EM SOJA NO CERRADO

Abstract

Brazil continues to be one of the main soybean producers in the world with great production in the Midwest region, where the Goiás state is one of the largest producers, being a large part of this production coming from Goiás southwest region. Soybean cultivation is limited by several pathogens. Among the problems of this crop, the nematodes H. glycines and Pratylenchus brachyurus stand out as a source of drop in crop productivity, as well as Helicotylenchus sp. as a possible cause of damage. The objective was to determine the best management alternative for the nematode H. glycines, P. brachyurus and Helicotylenchus sp. under cerrado cultivation conditions. The tests were carried out in two different areas, at the COMIGO Institute of Science and Technology (ITC), in the municipality of Rio Verde, and at the Segredo farm, in the municipality of Montividiu, two tests were carried out at each location, during the 2017/2018 and 2018/2019 harvests. In both locations, the trials followed the randomized block design. Several microorganisms and chemical molecules were tested; combining genetic, chemical and/or biological control, composing the second treatments: 1. Control (M7110), 2. Control (BRS 7380 / M7110), 3. Pasteuria nishizawae, 4. Purpureocillium lilacinum, 5. Bacillus subtilis, 6. B. subtilis + B. licheniformis, 7. Soil inducer, 8. B. licheniformis + B. subtilis + Trichoderma longibrachiatum, 9. Abamectina, 10. T. harzianum and 11. Cadusafós. Extractions were performed to quantify the H. glycines, P. brachyurus and Helicotylenchus sp populations. The best management alternative for H. glycines was genetic control linked to biological or chemical control, which showed the highest productivity, when compared to treatments with genetic control used in isolation. The biological control was efficient to control P. brachyurus and Helicotylenchus sp.