Armyworms in Small Grains - 2018

True Armyworm larva
July 16, 2018

Ian MacRae, NW Research & Outreach Center, Crookston, and Bruce Potter, SW Research & Outreach Center, Lamberton

Armyworm populations are present in several locations around Minnesota. While currently located in hotspots and not widespread, there have been several locations that required insecticide treatment. Armyworms do not overwinter here in Minnesota, our populations arise from adults blown in on southerly storm fronts in late spring and early summer. There have been several flights of armyworm moths recorded in MN light traps this summer. Preferred sites for egg laying include lodged areas of grasses, small grains and portions of other fields with high densities of grassy weeds, especially foxtail. Download the entire information sheet here.