After mating, females deposit egg masses on foliage, trees, or even buildings. Moths emerge from the soil from early April into May. Yellowstriped armyworms overwinter as pupae in the soil. The egg mass is covered with scales from the moth's body. Greenish at first, eggs gradually become pale pink to brown before hatching. Each egg is tiny and has microscopic ribs. Females lay up to 3,000 eggs with as many as 500 eggs in one mass. The hind wings are pale with a narrow dark line near the margin. Yellowstriped armyworm moths have dark forewings mottled with white and brown markings. The reddish-brown pupa is about 5/ 8 inch long, cylindrical, and slightly pointed at the rear. The sixth stage may be as long as 1¾ inches. It is smooth, pale gray to jet black with a yellowish-orange stripe along each side and a pair of black, triangular spots on top of most segments. The yellowstriped armyworm, Spodoptera ornithogalli, is a general feeder on herbaceous plants. They feed on the leaves of various herbaceous plants including agricultural crops such as alfalfa, potato, rice, sugar beet, and sweet potato.Description and Biology Skip to Description and Biology The larvae are black with yellow stripes and an inverted "y" marking on the head. Adults are on wing from March to April and from August to September. praefica are white or gray and have a small brown dot on the ventral side. praefica's fore-wings are paler and lack the blurry white stripe. It is similar in appearance to Spodoptera ornithogalli, but S. As of 4 October 2021 it is absent from the EPPO ( European and Mediterranean Plant Protection Organization) area, but is considered a high risk for invasion there. 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.
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