The SDS tolerance test was conducted in a field near Ames, Iowa. To ensure uniform and consistent disease pressure across plots, we planted dry oats infested with the SDS pathogen along with the soybean seed. Our field experiments show this method, developed by our project at Iowa State University, can provide a consistent level of disease pressure. Details of this method are available upon inquiry. Lines were replicated three times.
Low scores indicate a high level of tolerance.
Most entries in our tests are tolerant to this disease. Disease pressure this year was less than that of 1999 due to dry conditions in late summer and in general, yields were poor. Varieties with ratings of 3 or 4 show some level of susceptibility to the disease compared with susceptible controls. This information subject to a usage policy .