Received for publication August 26, 1974, Paper No. 4450 of the Journal Series of the North Carolina Agricultural Experimental Station, Raleigh. From a dissertation presented by the senior author in partial fulfillment of the requirements for the Ph.D. degree.
Present address: Department of Horticulture, Ohio State University, Columbus. This research made possible by a research grant from the Fred C. Gloeckner Foundation.
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