Graduate student, Dept. of Horticulture, Univ. of Maryland.
Assistant Professor. Present address: Dept. of Plant and Soil Sciences, Univ. of Massachusetts, Amherst, MA 01003.
Received for publication 29 July 1986. Scientific Article no. A-4478, Contribution no. 7471 of the Maryland Agricultural Experiment Station. From a thesis submitted by B.J.S. in partial fulfillment of the requirements for the MS degree. We gratefully acknowledge the assistance of Bruno Quebedeaux and Marla S. McIntosh. 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.
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