Hard, C. GustavSmith, Marvin E.Lofgren, J. A.Johnson, H. G.2014-12-302014-12-301964https://hdl.handle.net/11299/16868132 pages; includes photographs and drawings. 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.en-USNewsletter or Bulletin