Received for publication August 16, 1976. Paper No. 5048 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of products named, nor criticism of similar ones not mentioned.
Present address: Department of Horticultural Science, N. C. State University, Raleigh, N.C. 27607.
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