Received for publication 5 Aug. 1985. We are grateful to Mr. Andy Rose, Florida Citrus Groves Corporation, for providing the trees for the experiment and to Mr. Victor Chew, Agricultural Research Service/U.S. Department of Agriculture, for statistical analysis of the data. 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.