With more acres of dicamba resistant cotton and soybeans growing in fields around the country, there is more potential for postemergence dicamba applications during warmer, more humid conditions and more chances for the controversial herbicide to move off-target.
The situation has been particularly heated in in the South. An Arkansas man was shot and killed in 2016 over a neighborly dispute concerning off-target dicamba damage. Missouri and Tennessee have also been reporting off-target dicamba damage on significant acres.
Available for 2017 planting were the Monsanto Xtend soybeans and cotton that are resistant to Monsanto’s XtendiMax with VaporGrip, which is also sold as FeXapan by DuPont. In addition, BASF developed the Engenia dicamba formulation. The long-needed new tools are finally available to help tackle tough weed control situations but are bringing with them (not wholly unexpected) logistical and management issues. Arkansas and Missouri have even banned any additional dicamba applications for the remainder of the growing season, although subsequent label changes will allow some continued use in Missouri.