PublicationPublication Type: Report Authors: Lisa A. Schulte Moore; Heidi Asbjornsen; Atwell, R.C.; Hart, C.; Matthew J. Helmers; Thomas Isenhart; Randall K Kolka; Matthew Z Liebman; J. Neal; Matt O'Neal; Schultz, R.; S. Secchi; Thompson, J.; Mark D Tomer; John C. Tyndall Source: Iowa State University Extension, Iowa State University, Number PMR 1002, Ames, Iowa (2008) File: Schulte et al. 2008 ISUExt.PMR1002.pdf