Figure 2. Ward minimum variance cluster analysis of 38 soybean differentials grouped based on their reaction (resistance and susceptibility) to 93 isolates of Cercospora sojina. Distances represent semipartial R2 values. These are equal to the between cluster sum of squares divided by the corrected total sum of squares and correspond to the decrease in the proportion of variance accounted for as a result of joining the two clusters. The bolded and underlined cultivars represents those that were selected as the differentials representing each group.