Received for publication 12 Sept. 1985. Paper No. 10050 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27695-7601.Research supported by Consortium of Integrated Pest Management through Texas A&M Foundation (Grant No. 3884-1). Part of the PhD dissertation of J.M.S. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service 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.