Favorabilidade ao Desenvolvimento da Ferrugem Asiática da Soja no Estado de Minas Gerais

Economic and Agronomic Positioning of Fungicides in Conditions of Water Deficit in Soybean Cultures

“…Air temperature is also a determining factor for the infection process, and temperatures favorable to the development of soybean are also suitable for the development of rust. Therefore, it is estimated that the minimum period of foliar wetting for infection to occur is 6 hours, associated with temperatures between 20ºC and 25ºC (Lelis et al, 2009). This information, together with the meteorological data of the 2019/2020 crop season, provides an explanation for the low incidence of diseases such as Asian rust on the soybean crop.…”

“…Thus, there is no recipe for optimal phytosanitary management, but one that delivers to the farmer the most efficient control associated with greater profitability, because each crop has a distinct behavior in the predominance of diseases that are strongly associated with climatic conditions. For pathologies such as soybean Asian rust to develop, the disease triangle is necessary, that is, an interaction among the host, pathogen and the environment; if one of these does not interact with the other two the disease does not develop (Lelis et al, 2009). Gardiano et al (2020), in a work with 13 different fungicide treatments, found that the application of one to seven days after the detection of the first spores presented a lower percentage of infected leaf area if compared to the treatments that received the application later.…”