Black Cutworm

I sampled some small corn that was infested with black cutworms rather badly in places.  He told me that the corn was supposed to kill cutworms.  In his case it did not work.  I have seen other fields in the last 2 years that are supposed to do the same, but they had cutworms too.  I would like some seed agronomist to explain this to me. 

I hope everyone is still scoting for cutworm because they are still out there.  I even found a live worm today.