Former Graduate Research Associate. Presently Assistant Professor, Department of Plant and Soil Science, Southern Illinois Univ., Carbondale, IL 62901.
Received for publication 19 Apr. 1984. Salaries and research support provided by State and Federal Funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 52-84. We gratefully acknowledge the assistance of Dr. J.G. Streeter, Department of Agronomy, Ohio Agricultural Research and Development Center, for his advice and cooperation in the gas chromatographic analysis of apple root tissue extract. 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.