PPO Resistance???<BR>PPO or Protox <BR>Protoporphyrinogen oxidase <BR>Enzyme found in chloroplast and mitochondria <BR> <BR> 3 species worldwide <BR>Common waterhemp <BR>Kansas (2001) <BR>Illinois (2002) <BR>Common ragweed <BR>Delaware (2005) <BR>Wild poinsettia <BR>Brazil (2004)\ <BR> <BR>Ultra Blazer, Cobra, Goal, Reflex, Ronstar, Resource, Aim, Valor, Storm, Spartan<BR>