Omtvedt, I. T.Arthaud, R. L.Jacobs, R. E.2014-12-302014-12-301963https://hdl.handle.net/11299/16880612 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