Received for publication 2 Aug. 1984. Technical article No. 19735, Texas Agr. Expt. Sta. Mention of a trademark, proprietary product, or vendor does not imply endorsement by Texas A&M Univ. The authors express appreciation to Austin Stockton, John White, Zan Matthies, George Koch, and Kent Powell for assisting with the injections and to Jack Smith of Union Carbide for providing travel funds and Ethrel. 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.
Extension Horticulturist, Texas A&M University Agricultural Research and Extension Center, Stephenville.