Fungicidas no controle de doenças foliares em soja

Abstract

Soybean (Glycine max (L.) Merrill) is a crop of fundamental economic and social importance in Brazil and worldwide. This study provides a detailed analysis of disease control in soybean crops during the 2018/2019 harvest season in Claudia region, Mato Grosso. The experiment, designed in randomized blocks with nine treatments and four replications, aimed to evaluate the efficiency of different technologies in controlling Anthracnose (Colletotrichum spp.) and Target Spot (Corynespora cassiicola), two of the most relevant diseases affecting soybean production. These diseases are particularly concerning due to the increasing severity, fungi resistance to fungicides, and the emergence of new diseases, challenges faced seasonally by soybean producers in Brazil and other parts of the world. The tested treatments included various combinations of fungicides, such as Aproach® Prima, Vessarya®, Unizeb Gold®, Reference®, Difere®, and Prevenil®, applied at different stages of crop development. The research results showed no significant difference in control of Anthracnose and Target Spot among the treatments. However, a difference in grain mass was verified, where treatments with three applications showed a greater mass (in grams) of thousand grains. Furthermore, although there was no significant variation in kilograms per hectare (Kg. ha-1 ) among the treatments, one of the treatments stood out by achieving a yield of 3376.78 Kg. ha-1 , equivalent to 56.28 bags per hectare. It is remarkable the importance choosing and timing of fungicide applications in soybean, especially in the face of growing challenges related to the increased disease severity. The effectiveness of treatments may vary depending on the specific disease and plant development stage.