Winter scoop (Agrotis segetum) is a butterfly with a wingspan of about 35-50 mm. Fore wings of various colors: from yellowish-brown to dark gray. Four dark lines run across the wing. Hind wings light. Caterpillars of an older (sixth) age usually hibernate in soil at a depth of 15–30 cm. In spring, when the soil warms up to +10 ° C, they migrate to the surface layer and pupate in special caves. Pupae are reddish-brown, with two spikes at the posterior end (length up to 20 mm), develop for about a month. The years of butterflies of the first generation begins in late May and lasts until the II – III decades of July.
The butterfly is active during twilight and night hours. The intensity of the summer of butterflies can be detected using electric bug killers or a tub with wandering molasses, installed at a height of 20-25 cm from the soil surface.
A little solution consisting of molasses and water (1: 3) is poured into the trough, pre-fermented yeast (50 g per 1 liter of water) is added to it.
A few days after departure and additional nutrition on various flowering vegetation, females lay eggs on cultivated and weed plants, as well as on plant debris and soil surface.
Scoop eggs are hemispherical, radially ribbed, milky white or yellow, 0.5–0.9 mm in diameter. The female is very prolific and can lay up to 1000 eggs. After 4-15 days, clearly segmented caterpillars hatch with three pairs of pectoral and five pairs of abdominal legs.
At younger ages (first to second), they live on the underside of leaves or under their rosettes, gnawing small holes. Therefore, it is during this period that it is very important to carry out protective measures with biological and chemical preparations.
Starting from the third age, the caterpillars keep all the time in the surface layer of the soil, creeping out at night for food. During the night, one gluttonous individual can destroy up to 10 plants. Adult caterpillar up to 50 mm long, earthy gray in color with an olive tint and oily sheen.
First-generation caterpillars harm from mid-June to mid-July. They damage the seedlings and young plants of sugar beets, sunflowers, corn, millet, etc. After feeding, they pupate in the soil at a depth of 3-10 cm. The
the second generation of butterflies lasts from mid-July to early September. In the second half of August, egg-laying is observed in vegetable crops and fields reserved for winter crops.
Caterpillars of the second generation cause the greatest harm to winter cereals, damaging the sown grain and seedlings.