armyworm

Armyworms are the larvae of certain moths, primarily belonging to the owlet moth family (Noctuidae). These larvae are known for traveling in large groups, often referred to as "armies," as they move from one area to another. This behavior is particularly destructive because they consume grass, grains, and various crops, causing significant damage to agriculture.12

The term "armyworm" is most commonly associated with the species Mythimna unipuncta, found in eastern and central North America. However, the name is also applied to caterpillars of other lepidopteran species that exhibit similar mass-movement and destructive feeding habits. Some related species, like the army cutworm (Chorizagrotis auxiliaris), are also known for their destructive tendencies, especially towards forage crops and small grains.123