Received for publication May 2, 1978. Paper No. 5592 of the Journal Series of the North Carolina Agricultural Experiment Station. Portion of a thesis submitted by the senior author in partial fulfillment for the PhD degree, North Carolina State University, June, 1977. The authors thank Elanco Products Company, Indianapolis, Indiana, Kamlar Corporation, Rocky Mount, North Carolina, and Yoder Bros., Inc., Barberton, Ohio for donating ancymidol, pine bark humus and chrysanthemum cuttings, respectively.
The cooperation of Dr. R. J. Downs, Director of the North Carolina State University Phytotron, is gratefully acknowledged.
Use of trade names does not imply endorsement by the North Carolina Agricultural Experiment Station of the products named or criticism of similar products not mentioned.
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