A complete life cycle can be completed in 6 to 8 weeks but can range from somewhat less than 6 weeks to several months. Hosts Attacked Armyworms attack many different kinds of plants. When food is scarce, they will move to plants that are not normally attacked. Thus, armyworms can be found on nearly any plant as they migrate in search of edible foliage. The preferred host plants are corn, small grains and grasses.
Damage consists of foliage consumption.
Least preferred parts of the plants, such as stems and large leaf veins, will not be attacked unless caterpillars are near starvation. Control Armyworms should be controlled when they occur in large numbers or plant damage is becoming excessive. Preventive treatments normally are not justified because attacks are sporadic. Early detection seems to work best and is achieved by frequent, thorough inspection of plants. Follow all directions, particularly safety precautions, on the insecticide package label.