BIODEFENSIVOS INDUTORES DE RESISTÊNCIA SISTÊMICA NO MANEJO DE NEMATOIDES NA SOJA

Abstract

Due to large-scale production, soybeans have in turn several phytopathological problems with diseases and nematodes. Nematodes are currently very important pests in soybean crops, among the most harmful to the crop we have gall-forming (Meloidogyne spp), cyst (Heterodera glycines) and root lesions (Pratylenchus brachyurus). In this sense, the objective of this work is to evaluate the efficacy and agronomic practicability of the indoleacetic acid hormone (Stimutrop®) and the bacteria Bacillus amyloliquefaciens CNPSo3202, B. velezensis CNPSo3602 and B. thuringiensis CNPSo3915 (Biomagno®) in the management of Meloidogyne incognita in vitro and Pratylenchus brachyurus in vivo in soybean culture. The experiments were conducted at the University of Rio Verde (UniRV, Rio Verde – GO). In the studies, soybean seeds cultivar NEO680IPRO were used. In the in vitro assay, the design was randomized blocks, containing eight replications and four treatments, evaluations of infectivity and reproducibility were performed. Data were submitted to the Scott-Knott test. In the in vivo assay the design was randomized blocks, in a factorial arrangement with three methods of application, five treatments and eight replicates per treatment, the evaluation was 15 days after the last application of the treatment in the plants, where the number of eggs and total J2 per gram of root and per root system was evaluated. The data were submitted to factor analysis using the RStudio software. It is concluded that the biopesticides Stimutrop® and Biomagno induced systemic resistance to Meloidogyne incognita in soybean, as well as Biomagno® in greenhouse with Pratylenchus brachyurus in soybean crop.