The Fauba confirmed: the resistant strains of the fungus that causes a soybean disease are expanding.

A report from the Department of Phytopathology at the Faculty of Agronomy of the University of Buenos Aires (FAUba) confirmed the expansion in the Pampas region of resistant strains of Septoria glycines, the causative agent of soybean brown spot, to strobilurin group fungicides. The finding represents a significant change in the sanitary management of the crop, due to the loss of efficacy of one of the most widely used chemical groups in the country. The phytopathology team at the institution is made up of Doctors Francisco Sautua, Cecilia Pérez-Piza, and Marcelo Carmona. According to their report, the disease, initially reported in Japan and later in the United States, causes yield losses in Argentina that range between 8 and 15%. They detailed that its characteristic symptoms include brown, circular or oblong leaf spots, which in warm and rainy environments can progress to the upper leaves. "While global research on fungicide resistance has focused mainly on Cercospora kikuchii, ...