Frogeye leaf spot (FLS) is a mid-to-late season foliar leaf spot disease, caused by the fungus Cercospora sojina. It can be found in almost every soybean field in Tennessee, but it causes the most damage on highly susceptible varieties. This disease may be more severe in low-lying fields, creeks and river bottoms. In years when conditions are favorable, FLS can prematurely defoliate soybean plants, causing up to 50 percent yield loss on susceptible varieties. In the last four years, FLS caused a significant 7.8-8.0 percent loss to the Tennessee soybean crop. There are over a hundred different races of C. sojina across the South according to researchers at the University of Georgia. Some...
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