Silkworm Moth (Lycia Hirtaria)

Pest Type: Fruit Pests

Row: Lepidoptera – Lepidoptera

Family: Moths – Geometridae

It is found everywhere. It damages plants from 43 genera – all fruit and forest species.

Butterfly with a wingspan of 35-40 mm; the main color of the wings is yellow-gray or simply gray with brown stripes and black sickle-shaped spots between the veins of the outer edge of the wing, on the anal edge is terry yellow; brown fringe; antennae of females are filiform, males are cirrus. The eggs are 0.7 mm in size, freshly laid – green, before the revival of the caterpillar – blue-black with a metallic sheen. The caterpillar, which completed its development, is 45-50 mm long; the main body color has multi-colored aberrations: gray, brown, gray-brown or gray-purple; the chairman is yellow, in December the legs and shields are black-brown, the ventral shields are bright, on the back, there are two yellow spots on each segment, on the 11th segment there are two black speeches that have a light hairline. Pupa – 17-20 mm, dark brown, with a large cremaster.

Pupae hibernate in soil, in an earthen cradle, at a depth of 8-15 cm or in the surface soil layer, under fallen leaves. The flight of butterflies begins in early spring at an average daily air temperature of 12-15 ° C – in the first ten days of April, in the steppe zone – in March. The output is extended and lasts more than a month. Butterflies emerge from sexual production that has developed since the fall. Females are inactive, do not fly, and after fertilization, they lay eggs one by one or in small groups in the folds of the cortex at the base of the kidneys. Fertility – 650-850 eggs. Embryonic development lasts from 10-15 to 30-35 days.

Reborn caterpillars are very mobile. They live separately, at first they skeletonize young leaves, braiding it with cobwebs, older caterpillars roughly eat leaves, often eating them whole. Having completed the development, which lasts 30-35 days, the caterpillars pass to the wintering places, pupate in the earthen cradle and remain until the spring of next year. One generation develops per year.

Protective measures. Autumn tillage in aisles and near-stem circles. Loosening of the soil during the transition of caterpillars to pupation. With a population exceeding 4-6 eggs per 2 m of shoots, spraying with insecticides in the phenophase, isolation of buds, pink bud.

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