Received for publication 28 Dec. 1987. Journal Paper no. 11,427 of the Purdue Univ. Agricultural Experiment Station. Thanks to Mike Klesa, Fred C. Gloeckner Co., for supplying the lily bulbs for study. Special thanks to Terri Kirk, floriculture research assistant, Purdue Univ., for help in conducting the study. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.