DESEMPENHO DE FUNGICIDAS COMERCIAIS NO CONTROLE DA FERRUGEM ASIÁTICA DA SOJA

Abstract

One of the most frequent diseases that affect soybeans is rust, which has as its causative agent a fungus, as an obligatory and biotrophic parasite. This disease, when not treated properly and efficiently, can lead to significant losses of up to 80% in grain production. The main way to control Asian rust in soybean crops is through the use of fungicides. The present work aims to verify the agronomic performance of different commercial fungicides in the control of Asian soybean rust. The experiment was carried out at the Agricultural Research Center, located in the city of Rio Verde - GO, the treatments were arranged in a randomized block design with 13 treatments and 4 replications, the cultivar used, BONUS 8579 IPRO, with varying cycle from 112 to 118 days. There were three applications, during the phenological stages of R1, R3 and R5.1. Evaluations of the practice and effectiveness of fungicides were carried out based on disease severity, relative effectiveness, defoliation, selectivity (phytotoxicity), yield (thousand grain weight and yield) and yield in relation to the control treatment. The most effective treatments in controlling the severity of the disease were with Ativum and Cronnos. The treatment that showed the highest productivity was Elatus WG, qualifying a notable discrepancy in the results, since this treatment resulted in less effectiveness in controlling the severity of the disease. It is noteworthy that biological and abiotic factors may have directly influenced the productivity results. All levels of transfer are lower than evidence for severity and higher for yield, which emphasizes the importance of using fungicides to control Asian rust