Samuel F. Jenkins Jr.North Carolina State University, Raleigh, NC 27695
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Graduate Assistant. Present address: Assistant Scientist, CIBA-GEIGY Biotechnology, PO Box 12257. Research Triangle Park, NC 27709.
Associate Professor of Horticultural Science.
Professor of Plant Pathology.
Received for publication 25 July 1984. Paper No. 9424 of the J. Ser. of the North Carolina Agr. Res. Serv., Raleigh, NC 27695-7601. The authors gratefully acknowledge the technical assistance of R.R. Horton, Jr., and C.W. Holloway. 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.