George E. Carter Jr.Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29631
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Received for publication January 14, 1978. South Carolina Agricultural Experiment Station No. 1501. Published with approval of the Director. This research was supported in part by grant number 12-11-7001-1 58 from the USDA, Agricultural Research Service.
The author gratefully acknowledges the technical assistance of Deveree Kennedy and Suzan Simmons.