Yield and economic losses caused by Corynespora cassiicola on soybean under chemical control
Deivid Sacon1, Alexandre Jacques Bottan2, Laura Caroline Zanella2, Aline Netto2 and Leandro Luiz Borges3
1Instituto de Biotecnologia Aplicada à Agropecuária, Viçosa, MG, Brasil.
2ABC Agrícola, Sapezal, MT, Brasil.
3Universidade do Estado de Minas Gerais, Passos, MG, Brasil.
Target Spot is an important disease in soybean caused by the necrotrophic fungus Corynespora cassiicola. Recently, this fungus has gained importance in large crops such as soybeans and for its insensitivity fungicides reports. In this study, three assays were carried out with different application treatments in order to evaluate fungicide applications to control Target Spot and their interference on soybean productivity. Different application treatments were tested including fungicide products, doses, mixtures and number of applications, as well as estimate the application’s economic viability. Cultivar TMG 2378 IPRO was used and the applications were performed with a CO2 sprayer pressurized in a randomized block design with four replications. The harvest of 2.7 m2 useful area in the plot center was carried out with a stationary plot harvester and the yield was estimated for kg ha-1. For an economic analysis of the application treatments, the soybeans sale was considered at a fixed price of US$ 264 t-1, while the operating cost at a value of US$ 8. The fungicides spraying cost was estimated in kg of grains ha-1 based on the average of two budgets made. The fungicide mixtures bixafen+prothioconazole+trifloxystrobin+mancozeb and trifloxystrobin+ prothioconazole+mancozeb presented both yield increase and economic viability compared to control.
Mixtures of bixafen+prothioconazole+trifloxystrobin+mancozeb and trifloxystrobin+ prothioconazole+mancozeb have yield and economic viability to control Corynespora cassiicola.