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Legner, E. F.  1961.  An ecological study of some foliage-feeding insects

 on young nonbearing apple trees in Wisconsin.  Ph.D. Thesis, University of Wisconsin, Madison.  139 pp.


          The writer wishes to express his gratitude and sincere appreciation to his advisor, Dr. Earl Oatman, for his suggestions, supervision and constructive criticism during the progress of the investigations, and to Dr. James Torrie whose invaluable assistance in analyses made possibly many of the conclusions reached in this work.  Appreciation is also to the United States Insect Identification and Parasite Introduction Research Branch in Beltsville, Maryland and to the Department of Insect Pathology, University of California, Berkeley, for their work with specimen identifications.