Currently Assistant Professor of Horticulture. Dept.of Horticulture, The Pennsylvania State Univ., University Park, PA 16802.
Received for publication 28 Dec. 1987. New Jersey Agriculture Experiment Station Publication no. D12164-18-87, supported by state and U.S. Hatch Act funds. 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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