Mythimna unipuncta, commonly known as the armyworm moth, is a nocturnal insect found in temperate regions. It features a wingspan of 32-42 mm and distinct pale brown coloring with a small single spot on each forewing. The larval stage is known for its voracious feeding habits on crops.

Mythimna unipuncta, commonly known as the armyworm moth, is native to a wide range of regions across the world. It is predominantly found in North America, particularly in the United States and southern Canada. It also occurs in parts of Europe, North Africa, and Asia, indicating a broad geographical distribution.

The typical habitat of Mythimna unipuncta includes agricultural fields, grasslands, and open areas where its larval food plants are abundant. This species thrives in temperate and subtropical climates, where mild to warm temperatures and moderate rainfall support the growth of grasses and crops, which are essential for its larval development.

Mythimna unipuncta occupies an ecological niche as a herbivore, primarily feeding on grasses and cereal crops. Its larvae, known as armyworms, are notorious for feeding on a variety of grasses, including corn, wheat, and rye. This adaptability to different grass species allows them to exploit various environments, often leading to outbreaks in agricultural areas.