Western army cutworm

Systematic position: The insect belongs to the order Lepidoptera, family Noctuidae. It is a well-known agricultural pest widely distributed in the plains of North America, posing a significant risk to various food and forage crops.

Host crops: This pest is highly polyphagous. It feeds on a vast array of plant species, including wheat, barley, corn, alfalfa, sugar beets, and various vegetables. It often begins its feeding cycle on weeds before moving into newly sprouted crop fields.

Biology and life cycle: The species completes one generation per year. Larvae overwinter in the soil or under debris. In the spring, they emerge and feed voraciously at night. They pupate in the soil during late spring, and adult moths emerge to migrate, often covering long distances to find suitable host plants for egg-laying.

Damage and severity: Larvae are known for their habit of cutting off young seedlings at the soil surface, leading to stand reduction. During outbreaks, large numbers of caterpillars can devastate entire fields in a short period, moving together in large groups, which gives them the common name "army" cutworm.

Protection measures: Integrated Pest Management (IPM) is essential for controlling this pest. Cultural practices like clean cultivation and deep tillage can reduce overwintering success. When thresholds are reached, insecticide applications are necessary, typically timed to coincide with the larval feeding stage to ensure maximum efficacy.