Early Postemergence Herbicide Applications for Soybeans

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

I have been asked about weed control options for soybeans that were planted and did not get any preemergence herbicides applied before the soybeans have emerged. Glyphosate or Liberty can be used on Roundup Ready or Liberty Link soybeans, but spraying early will require herbicides with residual control. A few of the preemergence herbicides are labeled for application after emergence, but they will not control emerged weeds (this includes Anthem Maxx, Dual, Outlook, Warrant, and Zidua). The postemergence herbicides with residual control include Classic, FirstRate, fomesafen (Reflex), Pursuit or Raptor. Classic, FirstRate, Pursuit and Raptor are all group 2 herbicides and there are biotypes of redroot pigweed, Palmer amaranth, and common ragweed that are resistant to this group of herbicides. Refer to the Mid-Atlantic Field Crop Weed Management Guide for more information.