Moths mate and lay eggs, thus starting the life cycle over again. Lush plant growth is preferred by the adults for egg laying. Armyworms in the spring and summer occur in more distinct groups than later in the season. Fall populations of larvae often blend together several generations and may appear to be continually occurring. When feeding, larvae strip foliage and then move to the next available food.
High populations appear to march side by side to the new food.
Thus, the name armyworms has been applied. Development rates vary depending on temperature, food and other environmental factors. 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.