Received for publication 14 May 1984. Michigan Agr. Expt. Sta. No. 11263. The authors acknowledge the financial assistance of the Fred C. Gloeckner Foundation and American Florists Endowment, both technical and financial assistance of Oglevee Computer Systems, Connellsville, Pa., and chrysanthemum plants from Yoder Brothers, Inc., Barberton, Oh. 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.