Received for publication 21 June 1985. We gratefully acknowledge Gary Melchior and the Chemical and Agricultural Products Division, Abbott Laboratories, North Chicago, Ill. for their support and supply of ABG-3035, an experimental formulation of GA4+7; and Joseph G. Sullivan, Asst. Prof., Dept. of Horticulture, Univ. of Illinois, for assistance in data analysis. 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.