Programa de fungicidas no controle de doenças foliares em soja da safra 2020/21

Abstract

One of the main economic activities with worldwide prominence is soybean (Glycine max L.), but with the occurrence of diseases such as target spot (Corynespora cassiicola) and downy mildew (Peronospora manshurica), its productivity has been limited. The control of these diseases can be using resistant cultivars, crop rotation, seed treatment and the use of fungicides. Thus, the objective of this work was to evaluate fungicide programs for the control of these diseases with products available on the market. The experiment was conducted in the municipality of Sinop-MT in the 2020/2021 harvest, using a randomized block design, with 4 blocks and 10 treatments, plots measuring 2.5 m wide and 10 m long. Three fungicide applications were carried out at 40, 55 and 70 days after planting. It was evaluated the control of target spot (Corynespora cassiicola), downy mildew (Peronospora manshurica), phytotoxicity evaluation, productivity, thousand grain weight in the soybean crop and calculated the area under the disease progress curve was also performed. The data obtained were submitted to analysis of variance at a 5% probability level, and when a significant difference was obtained, the means were compared by the Scott-Knott test at 5% probability using the SASM-Agri program. The results obtained in disease control and phytotoxicity were not significant. As for productivity, the treatments that obtained a significant difference were treatments 2 (Viovan® + Controller® NT / Vessarya® + Controller® NT / Aproach® Power + Controller® NT), 6 (Fox® / Vessarya® / Aproach® Power), 7 (Vessarya® / Fox® / Aproach® Power) and 8 (Fox® Xpro / Vessarya® / Aproach® Power), with treatment 2 being the most relevant, obtaining an increase of 16.08 sc/ha when compared to the control. It was concluded that there was no difference between treatments in the control of leaf diseases and thousand grain weight, but there was a significant difference in productivity.