Fahning, M. L.Schultz, R. H.Conlin, B. J.2019-09-182019-09-181977-11https://hdl.handle.net/11299/2073031 online resource (PDF, 6 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