Former Graduate Teaching Assistant. Present address: USDA, Beltsville Agricultural Research Center, Soilbome Diseases Laboratory, Plant Protection Institute, Beltsville, MD 20705.
Received for publication 7 Mar. 1984. Paper No. 8426 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh 27650. Mention of trade or company names does not imply endorsement by the North Carolina Agricultural Research Service or the USDA of the 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.
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