Expanded production of common bean (Phaseolus vulgaris L.) in the humid tropics requires the development of cultivars with greater levels of resistance to web blight, a destructive disease caused by Thanatephorus cucumeris Frank Donk (anamorph: Rhizoctonia solani Kuhn). The objectives of this study were 1) to estimate the heritability of resistance to web blight in common bean and 2) to measure the effect of web blight on seed yield and quality. Sixty advanced lines from the cross' MUS 83/DOR 483//Tío Canela 75'were evaluated in