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Department of Entomology.
Department of Horticulture.
Received for publication 11 Oct. 1983. Authorized for publication on 9 Aug. 1983. Jo. Series Paper Number 6757 of the Pa. Agr. Expt. Sta. This research has been financed in part with federal funds from the Environ. Protect. Agency under grant number CR-806277-020 and USDA under agreement No. 82-CRSR-2-1000. The contents do not necessarily reflect the views and policies of the Environ. Protect. Agency or the USDA nor does mention of trade names of commercial products constitute endorsement or recommendation for use. The authors gratefully acknowledge the assistance of Stephen S. Miller and Louis J. Edgerton for critical review of the manuscript. Thanks also go to Gene Staub and Keith Nunamaker for technical assistance. 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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