Received for publication January 12, 1973. Portion of a thesis submitted by the senior author in partial fulfillment of the requirement of the Ph.D. degree, Michigan State University. Journal Article No. 6274 of the Michigan Agricultural Experiment Station.
Current address: Extension Entomology, 1735 Neil Avenue, The Ohio State University, Columbus, Ohio 43210.
Department of Entomology, Michigan State University.