Assistant Professor, Dept. of Horticulture.
Assistant Professor, Dept. of Agricultural Engineering.
Assistant Professor, Dept. of Entomology.
Received for publication 1 Apr. 1988. This manuscript was authorized for publication as Paper no. 7889 in the Journal Series of The Pennsylvania Agricultural Experiment Station on 28 Mar. 1988. 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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