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Received for publication July 11, 1981. Cooperative investigations of the U.S. Department of Agriculture and the North Carolina State University. Paper No. 7059 of the Journal Series of the North Carolina Agricultural Research Service.
Graduate Research Assistant, Department of Plant Pathology, North Carolina State University, Raleigh, NC 27650 and Plant Pathologist, Agriculture Research, Science and Education Administration, U.S. Department of Agriculture, North Carolina State University, Raleigh, NC 27650. Current address of Senior Author, Air Resources Board, Research Division, P.O. Box 2815, Sacramento, Calif. 95812.
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.
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