Garden scoop (Polia oleracea) – a very common type of scoop, which develops in two generations.
Butterflies (fore wings red-brown with transverse lines, hind wings gray) of the first generation fly out in May, the second – at the end of July – August. Females lay yellow-green eggs on the underside of the leaves in a slide of 40–70 pcs. Caterpillars 30–32 mm long, with variable coloring – from light green to dark brown.
Younger caterpillars look like moths, moving, they arch their backs in an arc. They are multinivorous, causing significant damage to vegetable crops – cabbage, radish, beans, turnips, peppers, tomatoes, not only in open ground but also in spring film greenhouses. Younger caterpillars feed on leaves, skeletonizing them from the underside. Adult caterpillars completely eat the leaves, and also feed on the pulp of the fruit, gnawing deep, large, irregularly shaped holes.
Cabbage scoop (Mamestra brassicas) is a dangerous, widespread and most harmful pest from the group of leaf-eating scoops. Butterflies with a wingspan of up to 50 mm, the front wings are gray-brown with a yellowish-white wavy line and two dark spots at the front edge, as well as with double dark jagged stripes across the wing. Cabbage moth develops in two generations. A pupa hibernates (dark brown, with a pointed end) in the soil at a depth of 3-5 cm. Butterflies of the first generation fly from mid-May to the end of June, the second – from the second half of July to the first half of September. Females lay hemispherical dark gray eggs in heaps (10–40 pieces each) on the underside of sunflower, pea, tobacco, lettuce, and beet leaves. But their favorite food is cabbage.
After 5-12 days, the green caterpillars hatching from the eggs first “scrape” the flesh of the leaves in small areas, and when they grow, creep out and gnaw out irregularly shaped holes on the leaves.
Adult caterpillars are grayish-green, yellowish-brown, sometimes almost black, usually bite into a head of cabbage, making moves in it and polluting it with liquid excrement.
A damaged head of cabbage rots emits an unpleasant odor, and eventually becomes a source of phytopathogenic infection.
In cauliflower caterpillars, scoops damage both the leaves and the head.