1. Impact from AMVAC is registered for use on both field and sweet corn. Corn growers are likely familiar with another herbicide, Callisto, with the same site-of-action, or ways of killing weeds. While Callisto can be used both preemergence and postemergence (POST), Impact is for POST use only from the spike stage of corn up to 45 days prior to harvest.
Impact has excellent activity against many annual broadleaf weeds including velvetleaf, pigweed, common ragweed, common lambsquarters and wild mustard. It also provides significant burndown against annual grasses like giant foxtail and large crabgrass.
The normal application rate is 0.75 fluid ounces per acre. The spray solution must include methylated seed oil (MSO) or crop oil concentrate (COC) and a nitrogen
fertilizer source such as urea ammonium nitrate (UAN) or ammonium sulfate (AMS).
For best performance, Impact should be tank mixed with 0.25 to 1 pound ai per acre of atrazine. Small grains can be planted three months after application; alfalfa, soybeans and several other crops can be planted after nine months. The rotational interval for many other crops is 18 months.

2. Status from BASF is registered for field corn but not sweet corn. Dicamba, one of the active ingredients in Status, is also the active ingredient in Banvel and Clarity. Each of these products has activity against a wide variety of broadleaf weeds.
Dicamba is rapidly absorbed by foliage and roots and readily moved throughout plants. It accumulates in growing points causing uncontrolled growth and plant death. Diflufenzopyr, a second active ingredient in Status, blocks movement of dicamba away from growing points and increases the activity of the dicamba. Status also includes a safener for dicamba on corn. It should minimize concerns about the types of adjuvants and tank-mix partners used with Status.
Status can be applied to field corn from 4 to 36 inches tall at rates of 5 to 10 ounces per acre. Adjuvants must be used with Status. For best results, combine a non-ionic surfactant (NIS), MSO, or COC with UAN or AMS.
If at least 1 inch of rainfall falls following application of 5 ounces per acre or less of Status, alfalfa, small grains and soybeans can be planted 30 days after the rainfall event.
Comparisons suggest that Status may not consistently provide better weed control than Banvel or Clarity. In addition, Status is more costly than those products and requires the use of spray additives.
Unless corn injury is a concern, growers should proceed with caution until we complete additional research with Status.