Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
The Group 15 herbicides, Dual, Warrant, Zidua can be applied to emerged soybeans for residual control, but they will not control emerged weeds. They can be applied as a tankmixture with products such as glyphosate, Liberty, Xtendimax or Engenia to provide residual control. Most of these herbicides have a cut-off timing when used after soybeans have emerged:
Anthem Maxx through the third trifoliate stage
Dual Magnum application timing is not specified on the label; but must be applied 90 days before the crop is harvested
Outlook up to the fifth trifoliate
Warrant up to the third trifoliate stage
Zidua up to the sixth trifoliate stage (recently extended)
Be sure to read the label for application rates when applied to emerged soybeans and total allowed rate for the season.