Pest Type: Fruit Pests
Row: Lepidoptera – Lepidoptera
Family: Leaflet Tortricidae
It is found everywhere, but mass reproduction is more often observed in the steppe zone. They damage apples, pears, quinces, cherries, cherries, apricots, plums, thorns, walnuts, oak, elm, birch bark, linden, birch, willow, poplar, honeysuckle, and other hardwoods.
Females with a wingspan of 18-22 mm, males – 15-19 mm; terry-golden front wings with dark transverse narrow wavy stripes and several spots; hind wings gray-brown with a yellow-red tint at the base. An egg 1.2 mm in size, oval, flattened, gray-green in color – from 10 to 150 eggs, in the form of flat shields up to 10 mm across, first dirty green, then gray. The caterpillar is 17-20 mm long, from green to gray-green, the head is brown, shiny, covered with sparse blond hair. Pupa – 15-17 mm, tan.
Eggs hibernate on the bark of trunks and branches. Caterpillars revive at the end of April – beginning of May at the sum of effective temperatures of 500 ° C (the lower threshold is 8 ° C). In southern Russia, the revival of caterpillars begins during the extension of inflorescences and late-ripening varieties of apple trees, and massive – during the isolation of buds. The revival of the caterpillars lasts from 7 to 13 days. Caterpillars of the first and second centuries penetrate the buds, skeletonize young leaves, eating round holes in it, penetrate the buds and gnaw stamens, pistils and petals.
Caterpillars of older ages fold leaves into tubules or tangles, also damage the ovaries and fruits, gnawing holes in the pulp of irregular shape, which sometimes reaches the seed chamber. Having completed the feeding, which lasts 30-40 days, the caterpillars pupate in the feeding places, most often in folded leaves. The development of the pupa lasts 8-12 days, depending on the temperature regime. Both pupation and flight of butterflies are extended and last up to two months – from early June to late July. Egg-laying begins 3-5 days after the departure of the butterflies. Fertility – an average of 250 eggs. The laid eggs remain until the spring of next year. The eggs can withstand a temperature drop of -27 ° С, at a lower temperature the death reaches 90% in two days. Annual generation.
A rosette leaflet is accompanied by two types of leaflets with a similar developmental cycle and the cultures that they damage.