Winter wheat is no different than other crops in its need to have a competition-free establishment period. Controlling weeds prior to seeding is a particularly effective time for that second step in control of biennial, perennial, and winter annual weeds, especially downy brome. Glyphosate products provide the most effective control in this window for weed control.
Pre-seeding herbicide applications also control early emerging volunteer plants. Control of volunteer seedling is particularly important when seeding into wheat stubble. Pre-seed glyphosate one to two weeks prior to seeding will break the “green bridge,” preventing wheat streak mosaic virus from carrying over to the winter wheat crop. Some growers tank mix residual broadleaf chemistry with their glyphosate to extend the weed control into winter wheat emergence and establishment. Early emerging weeds are generally some of the most competitive weeds a crop has to face. Removing early weed competition helps develop a well-established winter wheat crop, which will have a better ability to survive the winter.