Received for publication February 17, 1983. Paper No. 8743 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, N.C. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of products named, nor criticism of similar ones not mentioned. 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.
Present address: Department of Vegetable Crops, Univ. of California, Davis, CA 95616. The author expresses appreciation to Paul N. Lineberger for invaluable assistance in doing the research reported in this paper.
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