With spring a few months away, one issue that must continue to be addressed by the farmers of the eastern Corn Belt is the growing populations of herbicide resistant weeds.
Herbicide resistant populations of weeds such as Marestail and Giant Ragweed have existed for several years and are a growing problem. A few new additions to the list of herbicide resistant weeds have arrived recently, including Palmer amaranth. Now more than ever, it is critical that growers focus on employing effective herbicide programs.
Controlling these weeds will require attention to details such as, timing of herbicide applications, using multiple modes of action, use of residual herbicides, and scouting to determine what weeds are present and if any were not controlled by herbicides. There is a wealth of information available from universities which growers can, and should consult in order to stay ahead of problem weeds.
For successful weed control apply herbicides when weeds are small enough to be controlled, always follow herbicide labels, and avoid using low rates of herbicides. Additionally, any Palmer amaranth escapes must be pulled by hand before they go to seed.