Received for publication 4 Dec. 1986. Salaries and research support provided by State and Federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State Univ. Journal article no. 177-86. Appreciation is expressed to J.C. Schmid for technical assistance, to D.F. Kapus and E.N. Finney for tree care, and to Hilltop Orchards and Nurseries and Abbott Laboratories for producing the feathered trees. 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.