The following WSSA fallow field study was conducted in 2011and 2012 to determine the control of glyphosate resistant giant ragweed with 2,4-D and dicamba applied alone and in combination with glufosinate or fomesafen.  Dicamba and 2,4-D tank-mixed with glufosinate or fomesafen provided the highest level of control at 10 or 20 days after application (DAA). At 30 DAA, tank-mix combinations of 2,4-D or dicamba with glufosinate or fomesafen resulted in 86, 91, and 93% control, respectively. Tank-mixing combinations of 2,4-D and dicamba will be important for effective control of GR giant ragweed.