Most of our soil-applied herbicides provide about 4 to 5 weeks of control, depending on rate, soil types and soil moisture. Some of the first planted corn has been in the ground at least five weeks, so be sure to get back to those fields to see if a postemergence herbicide is needed. With the warm weather we are experiencing, species like Palmer amaranth, common ragweed, and common lambsquarters, will be growing fast and will quickly get to sizes that may limit herbicide effectiveness.
