Fall Armyworm is a 2021 Late-Season Pest
Fall armyworm is native to tropical regions in the western hemisphere. It can only successfully overwinter in the southern US (Texas and Florida), but the adults are strong flyers and capable of long-distance migration to northern states. Multiple migration events are possible each summer, and adults can be found in Iowa from June to August. This year, they are more abundant in the Midwest than usual and are causing late-season issues. As the common name suggests, larvae can still be active in October. Droughty conditions favor their development.