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Contributor Notes
Professor Emeritus of Horticultural Science.
Associate Professor of Horticultural Science.
Associate Professor of Plant Pathology.
Research Associate, Dept. of Horticulture.
Received for publication 12 Mar. 1984. Paper No. 9212 of the Journal Series of the N.C. Agricultural Research Service, Raleigh. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the N.C. Agricultural Research Service nor does it imply approval of the exclusion of other products that maybe suitable.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.
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