Source: Bill Johnson, Tom Jordan and Glenn Nice, Purdue Extension Weed Science

Purdue's Extension Weed Science group has received a few calls regarding corn replanting decision making in fields that were planted initially to Roundup Ready corn.

There are four legal options to kill an existing stand of Roundup Ready or GT corn in a replant situation — tillage, Select Max, Gramoxone + Sencor, or Ignite. These options are explored further.

Original press release