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Box plot of adult tree fungal disease susceptibility for pure Populus balsamifera (B), pure P. deltoides (D), and native hybrids (D × B). Disease susceptibility was assessed based on the number of uredia/cm2 for using controlled inoculations of three Melampsora species. Post hoc tests were used to identify differences between genotype class means when significant differences were detected using linear mixed-effect models (Table S6).
