Programas de fungicidas no controle de ferrugem asiática (Phakopsora pachyrhizi) na cultura da soja

Abstract

Since 2001, Brazil has faced the challenge of controlling the damage caused by the fungus Phakopsora pachyrhizi, which causes the disease known as Asian soybean rust. Since our country is the largest soybean exporter in the world, studies on the fungicides available on the market are necessary, exactly to help decision making in the field, optimizing the resources currently available. This work was carried out with the objective of evaluating different fungicides and a nanosystem in the control of Asian soybean rust in the 2020/2021 harvest. The experiment was conducted in the municipality of Sorriso/MT, in an experimental area, with geographic coordinates: Latitude 12º28' 28.6" and Longitude 55º42' 34.0", altitude 365 meters. The cultivar used was FOCO IPRO (Brasmax), with 13 treatments and 4 replications, in a randomized block experimental design. Through the analysis of the results of this experiment, it was concluded that there was a significant difference between the treatments, in which T6 (Aproach® Power + Viovan® + Vessarya®/Controller®), presented the lowest AUDPC of Asian rust (Phakopsora pachyrhizi). Regarding the parameters of productivity and weight of a thousand seeds, there was a significant difference between the treatments, in which T4 (Viovan®/ Controller + Vessarya®/Controller + Vessarya®/Controller + Aproach Power/Controller) showed the highest productivity, with 45.97 bags per hectare and 111.40 grams of thousand grain mass.