Received for publication 11 Aug. 1986. Paper no. 10602 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by NC State Univ. nor does it imply approval to the exclusion of other products that may be suitable. 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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