EFICIÊNCIA DE FUNGICIDAS EM MISTURA COM INSETICIDA NO MAJENO DE FERRUGEM ASIÁTICA DA SOJA

Abstract

Asian rust is widespread in all soybean producing regions in Brazil and phytosanitary management, due to the environmental conditions inherent to the country, is responsible for contributing substantially to the production of this crop. However, some of the tools adopted by technicians and farmers are put into practice without scientific support. For example, this situation occurs by mixing, at field level, fungicides and insecticides in the same application solution. Given this scenario, considering the common occurrence of this practice in soybean producing properties, the present study aimed to evaluate 3 fungicides: Azoxystrobin + Benzovindiflupyr, Picoxystrobin + Cyproconazole, Picoxtrobin + Tebuconazole + Mancozeb; associated or not with 2 insecticides: Emamectin Benzoate and Thiamethoxam + Lambda-cyhalothrin; in order to assess whether this interaction represents a significant change in the effectiveness of products with antifungal activity in relation to the control of Asian soybean rust (Phakospsora pachyrhizi). The parameters used in the analysis were severity, AACPD, defoliation and productivity. There was no effect on the parameters evaluated, by the association of any of the insecticides to any of the fungicides. All treatments with fungicides, alone or in association with insecticides, controlled the disease.