Received for publication May 15, 1972. Cooperative investigations of the Environmental Protection Agency and the U.S. Department of Agriculture, Research Triangle Park, N. C.
Plant Pathologist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, Raleigh, N.C.
Botanist and Horticulturist, respectively, Division of Ecological Research, Environmental Protection Agency, Research Triangle Park, N.C.
The authors acknowledge the assistance of Hans Hamann, Statistician, North Carolina State University, Raleigh.
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