BLACK CUTWORM DAMAGE COULD BE A PROBLEM Posted on May 19, 2017May 23, 2017 by Paul Benson As we approach 300 GDU’s, black cutworms become an issue in many NW Iowa corn fields. The following link is an excellent article published by Iowa State. If you have any issues or questions, give me a call at 712-260-4240. Black Cutworm Information