Received for publication February 25, 1980. Partial support by ICI Americas, Inc., Chempar Chemical Co., Velsicol Chemical Co., and the U.S. Fish and Wildlife Service was greatly appreciated. Appreciation to Dr. R. H. Myers, Professor of Statistics, VPI & SU, Blackburg, VA for assistance in analysis of data.
Associate Professor of Horticulture. The author wishes to express his thanks to David Carbaugh for assistance in this research.
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