Wawrzynski, Robert P.Ascerno, Mark E.2019-09-182019-09-181993https://hdl.handle.net/11299/2073561 online resource (PDF, 4 pages)This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.enScale insects of trees and shrubs (Revised 1993)Report