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Contributor Notes
Received for publication May 11, 1978. Approved for publication as Journal Article No. 73-78 of the Ohio Agricultural Research and Development Center, Wooster, Ohio. This investigation was part of a thesis submitted by the senior author in partial fulfillment of the M.S. degree.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Former Graduate Research Associate (present address: Department of Forestry, Iowa State University, Ames, IA 50011) and Professor of Horticulture, University of Illinois, Urbana, IL 61801.
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