Evaluation of Plant Introductions ofPhaseolusspp. for Resistance to White Mold

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Abstract
Higher levels of resistance to white mold (Sclerotinia sclerotiorum) than previously known in P. vulgaris were detected under growth chamber conditions using a limited-term inoculation method. Fifty percent or higher survival occurred in only 13 of 310 lines from Europe; 16 of 139 introductions with tolerance to root rot survived the white mold test. Most of these originated in Central or South America, although 2 lines from Turkey had a high level of resistance. A group of F5 plants derived from P. vulgaris .times. P. coccineus crosses had a comparatively high survival ratio. The 8 lines of P. coccineus ssp. polyanthus from Mexico that were tested all had a high level of resistance. A change in the limited-term inoculation method is described that makes it easier and faster to use for large-scale testing.

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