 These native North American larvae consume emerging small grains, alfalfa, and canola in the southern Great Plains and southern Canada.Larvae feed above ground at night and usually hide in soil during daylight, but will also feed on cloudy days.On dry, low elevation rangelands of the U.S. Intermountain West, army cutworms consume exotic cheatgrass ("Bromus tectorum") and mustards to produce cheatgrass "die-offs."