Sudden Death Syndrome (SDS), caused by Fusarium virguliforme, and brown stem rot, caused by Cadaphora gregata, are two of the most important soilborne pathogens that infect soybeans in Minnesota. Both of these pathogens infect soybean plants through their roots early in the growing season, but the plants remain visually asymptomatic until later reproductive stages. As with most soybean diseases, losses caused by these pathogens are most effectively and economically controlled through breeding for disease resistance. Advances through breeding for disease resistance are the result of developing an understanding of the genetics of soybean varieties and the relationship with resistance traits....