Received for publication 27 Oct. 1986. We gratefully acknowledge the technical assistance of A.C. Emmo and K.G. Livermore. Screening for scab, cedar-apple rust, and fire blight resistance was done by H.S. Aldwinckle and H.L. Gustafson. This work was supported in part by a grant from the Cornell Biotechnology Program, which is sponsored by the New York State Science and Technology Foundation and a consortium of industries. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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