Received for publication March 9, 1972.
This research was supported in part by the Division of Ecological Research, Environmental Protection Agency, Research Triangle Park, North Carolina. The authors wish to thank also, the Fred C. Gloeckner Foundation and The New York Florists’ Club, both of New York City, for their support for equipment.
Research Horticulturist and Research Plant Pathologist, respectively, Agricultural Research Center. The authors gratefully acknowledge the assistance of Kenneth Lehnert, Research Technician.
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