Received for publication April 27, 1979. Paper No. 6073 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh. Cooperative investigations of the U. S. Department of Agriculture and North Carolina State University. Mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty by the U. S. Department of Agriculture or the North Carolina Agricultural Research Service and does not imply approval of it to the exclusion of other products or vendors that also may be suitable.
Plant Pathologist, USDA-SEA-AR and Professor, Department of Plant Pathology, and Professor, Department of Horticulture, respectively.
The authors express gratitude to T. N. Gray and N. C Mingis for their technical assistance and to Mikkelsens Inc., Astabula, Ohio, for providing the plants used in this study.
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