Inheritance of resistance to white mold disease in Phaseolus coccineus

ABAWI, G. S. ; PROVVIDENTI, R. ; CROSIER, D. C. ; HUNTER, J. E.

In: Journal of Heredity, 1978, vol. 69, no. 3, p. 200-202

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    Summary
    A white-seeded selection of Phaseolus coccineus (P.I. 175829) from Turkey was found to be highly resistant to Whetzelinia screcotiorum. Intraspecilic crosses and backcrosses made with susceptible Phaseolus vulgaris germplasm indicate that a single completely dominant gene governs this high level of resistance. The symbol Ws is proposed for this gene. The inoculation procedure used to evaluate bean germplasm simulated natural disease occurrence in commercial bean fields. Plants at the susceptible blossom stage were sprayed with a suspension of ascospores obtained from aseptically produced apothecia. Immediately after inoculation, plants were placed in a mist chamber at 21-25°C for one week before final evaluation