1Received for publication August 24, 1978. Paper No. 5706 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, N. C. 27650.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must herefore be hereby marked advertisement solely to indicate this fact.
2Appreciation is expressed to Mikkelsens, Inc., Ashtabula, Ohio for provision of plants used in this study.
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