BIO: Greg Tylka is a professor in the Department of Plant Pathology at Iowa State University. Tylka has research and extension responsibilities and also coordinates the ISU Corn and Soybean Initiative. Tylka earned B.S. and M.S. degrees in biology from California University of Pennsylvania and a Ph.D. in plant pathology from the University of Georgia. The activities in Tylka's research program focus mostly on the biology and management of the soybean cyst nematode (SCN). Current research includes field evaluation of SCN-resistant soybean varieties and SCN management products, studies of the interactions of SCN with brown stem rot of soybean and the soybean aphid, determining the distribution of SCN HG types in Iowa, and determining the impact of SCN and other pests on soybean grain composition.