Soybean Rust (image) University of Illinois College of Agricultural, Consumer and Environmental Sciences Share Print E-Mail Caption Soybean rust was first discovered in the United States in 2004. It has been known to cause up to 80 percent yield loss in some parts of the world. New research identifies resistant sources from the USDA Soybean Germplasm Collection. Credit David Walker, USDA-ARS and University of Illinois Usage Restrictions For use with University of Illinois press releases. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.