Zins, MikeWildung, DavidPoppe, Steven R.Olen, Robert M.Schrock, Dennis2019-09-182019-09-181990http://hdl.handle.net/11299/2073741 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.enReport