The largest in the woodland and wooded steppe. Damages potatoes, tomatoes, hops, rhubarb, corn, raspberries, strawberries, sugar beet, sorrel, onions, cabbage, sometimes barley, rye, and also feeds on weeds, especially iris and water sorrel.
The butterfly is 28-40 mm in size, its front wings are from grayish-yellow to grayish-brown with a reddish hue, its transverse lines are brown, it has a round spot of the same color as the wing background, and its hind wings are grayish or reddish yellow with a dark stripe in the upper third of the wing. The egg is 0.7-0.8 mm in size, changing in color from yellowish-white to blackish-yellow. Caterpillar 40-50 mm long, from light yellow to saturated black, reddish stripes along the back, brown thoracic and anal plates, bristles on brown plates, spiracles black. Pupa-17-25 mm, yellow-brown, two growths on cremaster, club-shaped extensions at the ends and six bristles.
Eggs hibernate behind the scabbard of leaves of perennial grasses – ghouls of creeping grass, timothy, and national team hedgehogs, they are placed in groups, more often than not in groups of 20-60 eggs, in one or two rows. Caterpillars are born in May, eaten first on leaves, and then in the stems of cereals, in II-III age they pass into the stems of plants. They have six, less than five periods. They pupate at the beginning of July in the soil of damaged plants at a depth of 5-15 cm. The development of pupae lasts 13-30 days. Butterflies fly from the end of July to the middle of October, lay eggs for leaves in groups of 20-60, sometimes up to 200 pieces. Fecundity of female-260-480 eggs. One generation develops in a year.
Protection measures: Elimination of weeds, removal of post-harvest residues. Spraying with insecticides in two terms: in the period of appearance of caterpillars on grasses and the transition from cereals to plant stems to their penetration into the stems.