This diagram provides an illustration of the altered site of action mechanism for herbicide resistance to atrazine. In this illustration, it is obvious that the site of action in the resistant biotype of common lambsquarters is different that the site of action for the susceptible biotype.

Altered Site of Action<BR>Source: J.L. Gunsolus.  Herbicide Resistant Weeds.  1998. <BR>North Central Region Extension Publication 468.  <BR>