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Contributor Notes
Received for publication June 12, 1981. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.
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.
Research Horticulturist. Current address: U.S. National Arboretum, Washington, D.C. 20002.
Research Plant Pathologist.
The authors gratefully acknowledge the assistance of Kenneth Lehnert, Robert L. Taylor, and Rhonda Borisko, Research Technicians, and the Fred C. Gloeckner Foundation of New York City for their support for equipment; the EDU was supplied by E. I. duPont de Nemours and Company, Central Research and Development Department, Experimental Station, Wilmington, DE 19898.
Abstract
