Received for publication 16 Apr. 1983. Scientific Article No. A3445, Contribution No. 6518 of the Maryland Agricultural Experiment Station, Department of Horticulture. Prepared from a dissertation presented by the senior author in partial fulfillment of the requirements for the PhD degree, University of Maryland, 1979. 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.
Present address: Research Director, Springhill Nurseries, Inc., 110 W. Elm St., Tipp City, OH 45371.
Professor Emeritus, University of Maryland.
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