MANEJO QUÍMICO DA FERRUGEM ASIÁTICA DA SOJA

Abstract

Objective of the present work was to evaluate the effectiveness of the use of different active principles in the chemical control of Asian rust in crops in western Paraná. The experiment was carried out at the MBF Pesquisas Agronômicas experimental station in the municipality of Maripá, from November 2020 to April 2021. The experimental design used randomized blocks containing 5 treatments with 4 repetitions, the treatments were composed by an absolute witness and four chemical treatments with different active ingredients. Fungicide applications started 45 days after emergence, followed by two more applications with a 14-day grace period between them. The parameters analyzed were the incidence and severity of Asian rust, productivity, and mass of a thousand grains. The results were subjected to analysis of variance and compared by Tukey's test at 5% using the AgroEstat software. In the evaluations at 21 days after the application, there was a difference between the treatments and the witness. There was no difference in productivity between treatments, but in the mass of a thousand grains, treatment 4 was superior to the others. The climatic conditions during the conduct of the experiment influenced the results of the incidence of Asian rust, productivity, and mass of a thousand grains.