Alternative products to control late season diseases in soybeans/Produtos alternativos para o controle de doencas de final de ciclo na soja

• Published in: Ciência rural 2022-02, Vol.52 (2), p.1
• Main Authors: Gabardo, Gislaine, Pria, Maristella Dalla, Silva, Henrique Luis da, Harms, Monica Gabrielle
• Format: Article
• Language: English
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20210260

In the last crop seasons, the complex of late season diseases (CLSD) of soybean (Glycine max L. (Merrill)), has been causing considerable reductions in the crop yield. Currently, there are no cultivars resistant to all pathogens that causes CLSD. The present study evaluated the effect of applying the acibenzolar-S-methyl resistance inducer, alternative products and fungicide on the severity of CLSD in the soybean cultivar BMX Potencia RR during the 2013/2014 and 2014/2015 crops, in the field. The treatments for the experiments were: 1 - control (water); 2 - acibenzolar-S-methyl; 3 - calcium; 4 - micronutrients: copper, manganese and zinc; 5 - micronutrients: manganese, zinc and molybdenum; 6 - nitrogen-potassium fertilizer; 7 - Ascophyllum nodosum and 8 - azoxystrobin + cyproconazole with the addition of the adjuvant. Four applications of alternative products and two of fungicide were carried out in both harvests. A diagrammatic scale assessed the severity of CLSD at the phenological stage R7.1. The acibenzolar-S-methyl resistance inducer, alternative products (macro and micronutrients) and A. nodosum had no effect on the severity of CLSD in the two harvests. The fungicide (azoxystrobin + cyproconazole) reduced the severity of CLSD and prevented damage to productivity in both experiments. Key words: Glycine max L., Septoria glycines, Cercospora kikuchii, severity. Nas ultimas safras, o complexo de doencas de final de ciclo (DFC) da soja (Glycine max L. (Merrill)), vem provocando reducoes consideraveis no rendimento da cultura. Atualmente, nao ha variedades resistentes a todos os patogenos causadores das DFC. O objetivo do presente trabalho foi avaliar o efeito da aplicacao do indutor de resistencia acibenzolar-S-methyl, produtos alternativos e fungicida na severidade de DFC na cultivar de soja BMX Potencia RR durante as safras 2013/2014 e 2014/2015, em campo. Os tratamentos para os experimentos foram: 1 - testemunha (agua); 2 - acibenzolar-S-methyl; 3 - calcio; 4 - micronutrientes: cobre, manganes e zinco; 5 - micronutrientes: manganes, zinco e molibdenio; 6 - adubo NK; 7 - Ascophyllum nodosum e 8 - azoxistrobina + ciproconazol com adicao do adjuvante. Foram realizadas quatro aplicacoes dos produtos alternativos e duas do fungicida, nas duas safras. A severidade de DFC foi avaliada por escala diagramatica no estadio fenologico R7.1. O indutor de resistencia acibenzolar-S-methyl, os produtos alternativos (macro e micronutrientes) e A. nodosum nao apresentar