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Contributor Notes
Received tor publication September 20, 1980. Scientific Article No. A2862, Contribution No. 5914, Maryland Agricultural Experiment Station, Departments of Botany and Horticulture, College Park, MD 20742. From a thesis prepared by the senior author in partial fulfillment of the requirements for the MS degree, University of Maryland, 1980. Computer time was supported in full through the Computer Science Center of the University of Maryland. Plants were provided by De Vor Nurseries, Inc., Pleasanton, California; Paul Ecke Poinsettias, Encinitas, California; and Mikkelsens, Inc., Ashtabula, Ohio.
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.
Current address: Department of Plant Pathology and Physiology, Clemson University, Clemson, SC 29631.
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