Fehr, Robert L.Huhnke, Raymond L.Shelton, DavidWhite, WilliamWilliams, Howard2019-09-182019-09-181985https://hdl.handle.net/11299/2074361 online resource (PDF, 5 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.enReport