I have done a bit of research when I have had time today. Interesting insect (Satan's spawn) they are found in this part of the KS, actually can be found all the way into Minnesota, but typically east of the Rockies. They can not handle sub freezing weather, so the population migrates every year. The adults are moths. Only a short number of days as a worm. In their most damaging stage just prior to pupating into moths they can consume 42 lineal inches of wheat/ grass blade per day!!! They prefer the grass species, (corn, wheat, millet, etcc) will even destroy turf grass. They can and do sometimes eat things like soybeans, but it is not preferred. Depending on your location Fall plant dates for things like oats and Winter wheat are generally targeted so that emergence of the crop comes after the threat of Army Worm damage has mostly passed. Recommended to plant after Oct 1st here. They can be effectively killed with insecticide, but obviously that is an added expense and continual crop scouting is required if you are planting in a time period where damage is still highly possible.