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S.J. Sheen
Department of Plant Pathology, University of Kentucky, Lexington, Kentudty, U.S.A.
D. W. DeJong
Tobacco Research Laboratory, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Oxford, North Carolina, and North Carolina State University, Raleigh, North Carolina, U.S.A.
J. F. Chaplin
Tobacco Research Laboratory, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Oxford, North Carolina, and North Carolina State University, Raleigh, North Carolina, U.S.A