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>Common ragweed <BR>Wild poinsettia <BR> <BR>Many common herbicides have this mode of action!! <BR>Ultra Blazer, Cobra, Goal, Reflex, Ronstar, Resource, Aim, Valor, Storm, Spartan, ET<BR>