Post Soybean Herbicide Options and Application Restrictions

 

We have received some calls inquiring about post herbicide options for soybeans. If the field did not receive a burndown herbicide or a residual applied near planting, weeds like dandelion, resistant marestail/horseweed, etc. will be very difficult to control postemergence in soybean. Also, many of the typical soil applied residual soybean herbicides (e.g., Valor, Authority, Sharpen, metribuzin, etc.) cannot be applied over the top of soybeans because of injury concerns. Below is a list of herbicides that have primarily foliar broadleaf activity and/or residual activity and are allowed post along with their labeled application timings and strengths. Unfortunately, most of these herbicides will not handle dandelion, burdock, curly dock, etc. very well. Keep in mind that products such as Dual Magnum, Outlook, Warrant, and Zidua will not control emerged weed, but they can provide residual activity of certain annual weeds, so they will need to be tank-mixed with herbicides that have foliar activity. Additional details about these herbicides can be found in Table 4-14 of the Mid-Atlantic Field Crop Weed Management Guide . Below are brief descriptions of selected herbicides that can be applied post in soybean; keep in mind this is not a comprehensive list.