There have been reports of some fields of corn that due to flooding have an insufficient stand to keep.  There are several options to control a thin corn stand and replant back to corn.  Some of these options, like Select Max, need a waiting period before it can be planted back to corn.  Others, like tankmixes of paraquat plus atrazine, corn may be replanted right away.  Please find attached the results of a study Angela McClure and I conducted several years ago on destroying freeze damaged corn and replanting back to corn. We repeated the study the next year on a good stand of corn and got the same results. In this publication you will find a number of different herbicide options  that did a good job controlling an unwanted stand of corn.