Mark VanGessel, Extension Weed Specialist; mjv@udel.edu
Options for postemergence weed control in sweet corn is limited. Be sure to consider what weeds are present and how big they are, the size of the sweet corn, what is to be planted after the sweet corn, and how long until harvest. Most herbicides that have the most flexible herbicide rotations, also have fairly limited spectrum of control. Postemergence options for grasses include Armezon/Impact, Laudis, and Accent. For broadleaves, Cadet or Basagran will control a limited number of species and typically only very small plants. Armezon/Impact, Laudis, and Callisto will control a fair number of broadleaf weeds (and control is improved with addition of a little atrazine); all are safe on most processing sweet corn hybrids grown locally; and so check the rotational crops and consider the preharvest interval to help make the final selection.