Received for publication 10 Dec. 1984. Journal article No. J-4638 of the Agr. Expt. Sta., Oklahoma State Univ., Stillwater, OK 74078. 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.
Professor Emeritus, Dept. of Vegetable Crops.
Research Geneticist, USDA, ARS, and Assistant Professor, Depts. of Plant Breeding and Biometry, and Agronomy.