Abstract
Target spot, caused by Corynespora cassiicola, is a foliar disease of soybean in the Midsouthern United States. Increased target spot incidence and severity have been observed across parts of Arkansas and Mississippi regularly since 2007. Because target spot resistant cultivars are not available to manage target spot, soybean farmers rely on fungicides to reduce the potential yield losses associated with the disease. In general, fungicides within the quinone outside inhibitor (QoI) class have been the most widely used products for target spot management. As a result of increased and more widespread target spot during the 2016 season, a brief study was conducted using C. cassiicola monoconidial isolates derived from infected leaf tissue from Arkansas (n = 2) and Mississippi (n = 56) soybean to determine whether isolates were resistant to the QoI fungicides. In all, 27 isolates, one from Arkansas and 26 from Mississippi, were determined to contain the G143A substitution that confers complete resistance to the QoI fungicides.
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