Spodoptera praefica, the western yellow-striped armyworm, is a moth of the family Noctuidae found from British Columbia to California, east to Utah, and north to Alberta. it is absent from the EPPO (European and Mediterranean Plant Protection Organization) area, but is considered a high risk for invasion there.[1]
The wingspan is NaNmm. It is similar in appearance to Spodoptera ornithogalli, but S. praefica
The larvae are black with yellow stripes and an inverted "y" marking on the head. They feed on the leaves of various herbaceous plants including agricultural crops such as alfalfa, potato, rice, sugar beet, and sweet potato.