MOMENTOS DE APLICAÇÃO DE FUNGICIDAS NO CONTROLE DE DOENÇAS DE FINAL DE CICLO EM SOJA DE CICLO MÉDIO

Abstract

There are several obstacles that can reduce soybean production, making it difficult to reach its maximum potential, and one of these problems has been late-cycle diseases (LCD). Therefore, in addition to the practices commonly used to control diseases, such as the use of resistant cultivars, choice of the best sowing time, knowledge of the products and necessary dosages, it is also essential to know the best time and adequate application quantities. This study aimed to evaluate the efficiency of time and number of fungicide applications in the soybean cycle. Soybean planting was carried out in the no-tillage system (NTS), using the medium-cycle DM73i75 cultivar. Evaluating the use of different fungicides in the control of Asian rust. The efficacy evaluations of the products for controlling Asian rust were carried out based on the severity of the disease, defoliation, productivity in bags per hectare and phytotoxicity. The greatest response to treatments was that using preventive applications, called zero application, which resulted in less defoliation and a greater increase in productivity.