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James F. Chaplin
Tobacco Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Oxford, N.C., U.S.A., and Department of Crop Science, North Carolina State University, Raleigh, North Carolina, U.S.A.
Harvey W. Spurr
Tobacco Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Oxford, N.C., U.S.A., and Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina, U.S.A.