Evaluation location: North Dakota, United States
Fifteen plants (three replicates of five plants) were inoculated with race 3 rust spores mixed with Soltrol 160 mineral oil. Plants were evaluated on the basis on percent leaf area covered with pustules and grouped into the following categories: 0, 0.1, 0.2, 1.5, 1.0, 2.0, and 5.0% leaf area covered. Plants with 0.5% or less of the foliage covered by rust were classified as resistant.