The effectiveness of supplementing local bean (Phaseolus vulgaris) mixtures with varieties resistant to angular leaf spot, caused by Phaeoisariopsis griseola, was evaluated in the Great Lakes region of Africa. The severity of angular leaf spot was lower (P=0.05) in farmer mixtures supplemented with 25% or more of resistant lines BAT76 or A285 in three of four seasons than in mixtures without resistant lines. Significant decreases in angular leaf spot severity were also obtained in the new mixtures when measuring both original farmer and new resistant lines (.)