Mikal E. Saltveit Jr.Department of Horticultural Science, North Carolina State University, Raleigh, NC 27650
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Received for publication January 22, 1979. Paper No. 5903 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of products named, nor criticism of similar ones not mentioned.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
The author expresses appreciation to Ms. Susan Hale for assistance in performing this research.