MANEJO DE FERRUGEM ASIÁTICA DA SOJA COM FUNGICIDAS MULTISSÍTIOS

Abstract

In addition to its economic importance, soybeans have valuable nutritional characteristics, both for human and animal consumption, as a source of protein, fiber and unsaturated fats, among others (LEDERMANN, 2015). In the 2022/23 harvest, Brazilian production was 322.8 million tons, becoming the world's largest producer of the grain, and a projection of 319.5 million tons for the 2023/24 harvest (CONAB, 2023). With all the importance of cultivation and its ever-increasing demand, greater production is increasingly needed, but phytosanitary problems have made this management difficult for the producer in search of high productivity, such as pests and diseases. Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, is the main pathogen capable of damaging soybeans and reducing their productivity. (EMBRAPA SOJA, 2020) Chemical control has become essential for managing the disease, since its high severity could decimate crops. Excessive number of applications, spraying only after detection of the problem and under doses stand out among the main failures occurring in the field. Resistance has become a fact of life for the crop protection industry (GODOY et al 2010). To manage the disease, it is currently recommended to use products with one or more modes of action per application, and also the use of multisites, which are fungicides with a broad spectrum of action, thus helping to prevent fungus resistance. In this way, the respective work sought to evaluate the effectiveness of different products and active ingredients associated with multisites, in controlling Asian soybean rust, evaluating the percentage of defoliation, severity and finally productivity.