Root Rot Resistance in Common Bean Germ Plasm of Latin American Origin

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Abstract
Resistances of common bean (P. vulgaris L.) to Fusarium solani, Rhizoctonia solani, Sclerotium rolfsii and Pythium spp. were studied. N203 (PI [plant introduction] 203958) displayed only intermediate field resistance of F. solani, whereas ''Cornell 2114-12'' and several tropical cultivars were highly resistant. Resistance to Pythium spp. was common among colored-seeded tropical materials. Resistances to R. solani and S. rolfsii were measured by plant survival because hypocotyl lesions and disease severity had little effect on plant yield. Resistance to R. solani was comparable to that of other Latin American bean cultivars. Many tropically adapted cultivars demonstrated resistance to the pathogens superior to that of previously reported sources.

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