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Associate Professor.
Graduate Student.
Received for publication August 20, 1982. Technical Contribution No. 2068 of the South Carolina Agricultural Experiment Station, Clemson. This research was supported by grant funds from the United States–Israel Binational Agricultural Research and Development Fund (Grant No. 1-198-80). 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.