Goodrich, R. D.Meiske, J. C.Jacobs, R. E.2014-12-302014-12-301976https://hdl.handle.net/11299/1688583 pages; includes drawing. 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