Received for publication November 24, 1972. Contribution from the Departments of Horticultural Science and Plant Pathology. Published with the approval of the Director of Research as Paper No. 3912 of the Journal Series.
Associate Professor of Horticultural Science, Mountain Horticultural Crops Research Station, Fletcher, North Carolina.
Professor Plant Pathology, North Carolina State University, Raleigh, North Carolina.
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