Large Yellow Underwing Moth

The large yellow underwing moth, also known as the winter cutworm or Noctua pronuba, is an invasive species that was first identified in Oregon around 2001. It is native to western Europe and was accidentally introduced to North America in 1979, likely by flight, and has since spread across the continent to the Pacific Coast. The moth is most damaging during its larval stage, which is known as the winter cutworm. The larvae feed on a wide variety of plants at night when the air temperature is at least 40°F, and can be found in many different landscapes, including agricultural fields, lawns, pastures, and urban areas. In late spring, the larvae burrow underground to pupate and form chrysalids, and adult moths emerge a few weeks later, depending on the temperature. Large yellow underwing moths are often migratory before laying their eggs, which can help establish new populations in other areas.