Disease severity (percentage of leaf area covered in pustules) was visually estimated using a standard scale from the Australian Cereal Rust Laboratory, University of Sydney [7]. This scale measures the severity of stripe rust using scores ranging from one (no symptoms) to nine (abundant sporulation across the whole leaf area with no evidence of individual stripes). Scores for each plot were recorded as the average of responses for the two uppermost leaves of all plants in a plot at each assessment time. Visual assessments of infection were made 116 days after sowing (DAS) in 2006 and 113 DAS in 2007, corresponding approximately to early milk development (GS 75) in each season. For analysis, the scores were converted to percentages using the midpoint of each category on the scale and arcsinView the MathML source transformed for analysis of variance (ANOVA).