Host rangeĪrmyworm adults feed on plant nectar and are not a threat to crops. In Minnesota, annual infestations are the result of adult moths migrating from wintering areas in the south. The armyworm cannot survive winters with persistent freezing winter temperatures. The highly migratory behavior of the armyworm adults allows them to exploit new geographic areas when weather is suitable. In North America, crop damaging infestations are most often observed east of the Rocky Mountains as far north as southern Canada. It is a member of the moth family Noctuidae, a large group that includes most species of cutworms. The armyworm is native to the Americas, but localized invasive populations have been observed in areas of Europe, Africa, the Mideast, and Asia. Mythimna unipuncta (Haworth, 1809), (Lepidoptera: Noctuidae) Distribution
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