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Root lesion nematodes limit the productivity of several crops of economic importance, requiring alternatives for their management. Resistance inducers activate enzymes involved in defense mechanisms and micronutrients can influence this process by acting as enzymatic cofactors. Thus, the objective of this study was to evaluate the effect of foliar application of a commercial organomineral fertilizer and its association or not with zinc (Zn) and manganese (Mn) micronutrients on the Pratylenchus brachyurus suppression and soybean plant development under greenhouse conditions. Shoots of soybean were treated 10 days after germination and inoculated with 5000 nematodes/plant five days after the treatments, using untreated plants as controls. Treatments consisted of a commercial product based on phosphorylated mannanoligosaccharide derived from the cell wall of Saccharomyces cerevisiae (here coded as MOS), Zn, Mn, MOS+Zn, MOS+Mn or MOS+Zn+Mn. At sixty days after establishment of treatments, the plants were collected and evaluated for vegetative analysis, nematological analysis and nutrient contents. The work was repeated at different times: experiment 1 from November 2016 to January 2017 and experiment 2 from October to November 2017. All treatments were efficient in controlling P. brachyurus in at least one of the evaluated nematological parameters, compared to the control. However, only the plant spraying with MOS+Zn results in significative reduction of the total number of nematodes and the number of P. brachyurus nematodes per gram of soybean root in both experiments. In addition, spraying of plants with Mn increased shoot dry weight and all treatments resulted in higher concentrations of copper, Zn and Mn in soybeans leaves compared to control. keywords: Mannanoligosaccharide. Nutrient. Zinc. Manganese. Pratylenchus brachyurus. INTERAÇÃO ENTRE INDUTOR DE RESISTÊNCIA E MICRONUTRIENTES NO CONTROLE DO NEMATOIDE DAS LESÕES E NO DESENVOLVIMENTO DE PLANTAS DE SOJA RESUMO Nematoides das lesões radiculares limitam a produtividade de diversas culturas de importância econômica, sendo necessárias alternativas para seu manejo. Os indutores de resistência ativam enzimas envolvidas nos mecanismos de defesa e os micronutrientes podem influenciar esse processo, por atuarem como cofatores enzimáticos. Desta forma, objetivou-se avaliar o efeito da aplicação foliar de um fertilizante organomineral comercial e sua associação com os micronutrientes: zinco (Zn) e manganês (Mn) no controle de Pratylenchus brachyurus e no desenvolvimento da soja. As plantas tiveram sua parte aérea tratada, após 10 dias da germinação e foram inoculadas cinco dias após o tratamento, usando-se plantas não tratadas como testemunha. Os tratamentos consistiram de um produto comercial a base de mannanoligossacarídeos derivados da parede celular de Saccharomyces cerevisiae (aqui codificado como MOS), Zn, Mn, MOS+Zn, MOS+Mn ou MOS+Zn+Mn. Após 60 dias da inoculação, as plantas foram coletadas e avaliadas quanto aos parâmetros vegetativos, nematológicos e teores de macro e micronutrientes. Todos os tratamentos foram eficientes em controlar P. brachyurus em pelo menos um dos parâmetros nematológicos, com redução de 28 a 70% da população do nematoide comparativamente à testemunha, porém somente o tratamento da soja com MOS+Zn resultou em redução significativa da população total de P. brachyurus e número de nematoide por grama de raiz nos dois experimentos. Além disso, a pulverização das plantas com Mn proporcionou aumento da matéria seca da parte aérea e todos os tratamentos resultaram em maiores concentrações de cobre, Zn e Mn nas folhas em comparação a testemunha. Palavras-chave: Mannanoligossacarídeo. Nutriente. Zinco. Manganês. Pratylenchus brachyurus.  Corresponding author Received for publication in 04/01/2019; accepted in 05/12/2020. Paper extracted from undergraduate final project of the first author. Departament of Agronomic Sciences, Universidade Estadual de Maringá, Umuarama, PR, Brazil; nattyconduta@gmail.com ORCID: 0000-0002-4420-2080, crdiasarieira@hotmail.com ORCID: 0000-0002-1567-816X. Post Graduate in Agronomy, Universidade Estadual de Maringá, Maringá, PR, Brazil; mo_nike_@hotmail.com ORCID: 0000-00021262-2769, lu.rinaldi@hotmail.com ORCID: 0000-0002-8458-6947. INTERACTION BETWEEN RESISTANCE INDUCER AND MICRONUTRIENTS ON THE CONTROL OF ROOT-LESION NEMATODE AND THE DEVELOPMENT OF SOYBEAN PLANTS N. S. CONDUTA et al. Rev. Caatinga, Mossoró, v. 33, n. 3, p. 591 – 598, jul. – set., 2020 592 INTRODUCTION Soybean (Glycine max (L.) Merril) is a crop of economic importance in the national and international scenario, being one of the main agricultural products commercialized worldwide. However, continuous and extensive cultivation has raised concerns regarding the occurrence of pests and diseases, especially nematodes, which may become a limiting factor for the crop. In recent years, Pratylenchus brachyurus (Godfrey, 1929) Filipjev and Schuurmans Stekhoven became the predominant parasite among nematodes in soybean due to changes in the production system and incorporation of areas with sandy soil, which increased the vulnerability of the crop (ALVES et al., 2011). Changes in the cropping system, such as the adoption of no-till system, succession with host crops, such as soybean and maize, and the gradual growth of soybean cultivation in areas with sandy soils, have increased the losses caused by this pathogen (EMBRAPA, 2010). This nematode is a migratory endoparasite, whose infection causes rupture and destruction of the cortical tissue, causing necrotic lesions which compromise the absorption of water and nutrients; therefore, plants in the field exhibit unequal size and reduction in productivity (ALVES et al., 2011). The control of this nematode is complex and requires the adoption of an integrated management system, in which priority should be given to practices with a lower environmental impact. Among the alternative management practices, the use of resistance inducers has been demonstrated promising in the control of root lesion nematodes in resistant and susceptible cultivars of maize (PUERARI et al., 2015). Resistance inducers can act in different ways, involving several stages and pathways, but always leading to the activation of plant defense system (RODRIGUES; BEZERRA NETO; COELHO, 2006). Some products not yet registered for resistance induction have demonstrated potential for nematode control, such as MOS (commercial product based on mannanoligosaccharides and nutrients), which has been proven efficient to control Meloidogyne javanica (Treub, 1885) Chitwood (1949) and P. brachyurus in soybean (MIAMOTO et al., 2017). Another factor that may aid in the defense system against pathogens is plant nutrition, particularly micronutrients, which act as enzymatic cofactors and are constituents of some essential enzymes in the defense mechanisms (COUTO et al., 2016). Thus, the hypothesis that micronutrients can improve the efficiency of resistance inducers and favor the control of pathogens is formulated; however, there are no studies regarding this association in the literature. Thus, the objective of this study was to evaluate the efficiency of the MOS based product, isolated or associated with micronutrients, in the control of P. brachyurus in soybean. MATERIAL AND METHODS The experiment was carried out in a greenhouse, under the geographic coordinates 23° 45'59" S, 53°19'30" W, and 442 m altitude, in a completely randomized design, with eight treatments and eight replicates, in two different periods: experiment 1 from November 2016 to January 2017 and experiment 2 from October to November 2017. The minimum and maximum average temperatures during each experiment were 20.5 and 30.9 °C and 18.6 and 29.6 °C, respectively. Initially, soybean seedlings cv. ‘Pintado’ were produced in polystyrene trays containing Bioplant commercial substrate. Five days before transplantation, seedling shoots were sprayed with the doses recommended by the manufacturers, with a product based on mannanoligosaccharide derived from the cell walls of Saccharomyces cerevisiae Meyen (MOS), Zn, Mn, MOS+Zn, MOS+Mn and MOS+Zn+Mn. The composition and recommended dosage are shown in Table 1. Untreated and inoculated plants and untreated and non-inoculated plants were used as controls. Table 1. Composition and dosage of the products used in the experimental treatments. Source: Agro-Mos, Alltech Crop Science; Albion (Product Manufacturers). Product Composition Dosage MOS Sulfur 2.75% (46.12 g L); Copper 2.00% (24.60 g L); Zinc 2.00% (24.60 g L). Density: 1.23 g cm; pH 2.84 1 L ha; 200 mL 100 L of water Metalosate Zinc Zinc 6.8% (82.26 g L); Contains 15.0% of agent chelating amino acid. Density: 1.21 g cm 2 L ha Metalosate Manganese Manganese 6.0% (72.6 g L); Contains 17.4% of agent chelating amino acid. Density: 1.21 g cm 1.5 L ha