Mayrose, Vernon B.Bache, David H.Libal, GeorgeHays, VirgilMannings, Connie L.2019-09-182019-09-181986https://hdl.handle.net/11299/2074561 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