EFICÁCIA DO CONTROLE BIOLÓGICO E QUÍMICO DE Pratylenchus brachyurus NA CULTURA DA SOJA

Abstract

The soybean crop is one of the most important for Brazilian agribusiness, with the country being the world's largest producer and exporter of this grain. Among the phytosanitary problems that affect the crop, phytonematodes stand out. In Brazil, one of the main phytonematodes of economic importance in soybean is the lesion nematode (Pratylenchus brachyurus). Due to its affinity with several species and the lack of soybean cultivars resistant to this phytonematode, the use of nematicides is an important control tool. The objective of this work was to evaluate the action of chemical and biological nematicides to control P. brachyurus in the soybean crop. The experiment was conducted in an area of commercial soybean production with a history of infestation by P. brachyurus. The treatments consisted of: Control without application, Pyraclostrobin + Methyl thiophanate + Fipronil, Pyrclostrobin + Methyl thiophanate + Fipronil + Bacillus firmus and Pyraclostrobin + Methyl thiophanate + Fipronil + Fluopyran. A reduction in P. brachyurus population in the soil was observed at 30, 60 and 90 DAP when methyl Thiophanate + Fipronil + Fluopyran was applied, however no effect of treatments on plant height and grain yield was observed.