Most recently, Ian MacRae, entomologist with U of Minnesota, is reporting spotty infestations in NW Minnesota. Armyworms do not overwinter in the region, our populations arise from adults blown in on southerly storm fronts in late spring and early summer. The earlier the growing season, the earlier it is necessary to scout armyworms. These insects are dark green to light brown and have a light stripe down the center of their back.
Adults lay eggs in grassy or weedy areas or in lodged grain.
Armyworms, like some cutworms, tend to feed at night and hide throughout the day. If feeding damage is found in the foliage and no other responsible insects pest can be found, scout for armyworms by parting foliage on the plant and inspecting the plant and the soil below for small fecal pellets. If 4 to 5 worms or more are found per sq. Refer to the previous issue for insecticide recommendations. One note regarding Warrior T insecticide and Folicur fungicide.