GERMPLASM SCREENING OF PHASEOLUS-VULGARIS FOR RESISTANCE TO SCLEROTINIA-SCLEROTIORUM

Field tests for resistance to infection by Sclerotinia sclerotiorum we re conducted on selections of Phaseolus vulgaris which had been screen ed as seedlings in inoculation tests in growth cabinets. Field tests i n 1989, 1990 and 1992, grown in plots artificially infested with scler otes, confirmed the relative resistance of accessions Rico 23, Ex Rico 23, NY 5223, and NY 5268 which had been identified in other studies. New sources of resistance were also identified in accessions PER 257, Bat 447-1C, Bac 17, Xan 170, A480, Pad 22, Flair, Pearly Wonji, Shimi, Uribe Redondo and PI263958. The effectiveness of resistance in protec ting grain yield in the presence of disease was not clearly demonstrat ed, although a greater level of resistance was associated with reduced yield loss.