Programa de fungicidas no controle de doenças em soja - safra 2021/2022

Abstract

The soybean (Glycine max (L.) Merrill is one of the most important crops for the economy of Brazil, during its cycle, among the factors that limit its production and grain quality, are plant diseases, which increase by the incorrect use of fungicides and susceptible cultivars. Thus, the objective of this work was to evaluate the effect of fungicide programs on disease control and productivity of soybean in the 2021/2022 season. The experiment was conducted in the city of Sinop-MT in the experimental area of Pastorello Consultoria. For the conduct of this experiment, we used the cultivar Bonus 8579 RSF IPRO Brasmax. The experimental design used was a randomized block design, with 4 blocks and 10 plots of 2m wide and 5m long. Three applications of fungicides were made at 40, 55 and 70 days after planting. The control of Target spot (Corynespora cassiicola), Septoria (Septoria glycines), Frog eye spot (Passarola sojina) and Anthracnose (Colletotrichum spp.), productivity, weight of one thousand grains in soybean culture were evaluated and the area under the curve of disease progress was calculated. The data obtained were submitted to variance analysis at 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 treatments tested did not reduce diseases severity, however, treatment 8 with Viovan®+Controller®, Vessarya®+Controller®, Viovan®+Controller® provided the highest yield, with 3,552.25 kg/ha, highest thousand-grain weight and 53.59% efficiency in the control of Target Stain, 51.55% in the control of Septoria and 31.25 in the control of Anthracnose.