PPO Resistance Already Exists!<BR>Common waterhemp <BR>2001 (KS) <BR>Resistant to POST but not PRE <BR>2002 (IL) <BR>2005 (MO) <BR> <BR>Common ragweed <BR>2005 (DE) <BR> <BR>Wild poinsettia <BR>2004 (Brazil) <BR> <BR>*<BR>