Motley Grape (Theresia Ampelophaga)

Pest Type: Grape Pest

Row: Lepidoptera – Lepidoptera

Family: motley (string) – Zygaenidae

Distributed in the south of the country. It damages grapes.

Butterfly with a wingspan of 22-25 mm, blue or blue-green on top. Egg 0.4-0.6 mm in size, oblong, yellow, with a mesh pattern. Caterpillar 16-18 mm long, light gray; brown warts with a bunch of orange hairs are placed along the body in four rows. Pupa – 11-15 mm, yellow-gray, with dark dots on each segment.

Caterpillars of the II-III centuries overwinter in cocoons under the lagged bark, in cracks on the trunks and stumps of grapes, less often in plant debris. In the spring, during the swelling of the buds, the caterpillars climb the vine bush, bite into the buds and eat away their contents.

After that, they switch to young leaves, in which the parenchyma gnaw out from the lower side, leaving the upper cuticle. Caterpillars of recent centuries gnaw through holes. During development, five molts five times. Active in the morning and afternoon; hiding before the sunset. The caterpillar’s tumbling falls to the ground and coils into a ring. At the beginning of the flowering of grapes, they pupate in cocoons under the lagged bark, under fallen leaves, in the upper layers of the soil.

After 14-18 days, butterflies that do not feed fly out, lay eggs in groups of several tens to two hundred on the lower side of the leaves. Fertility – 400-600 eggs. After 8-10 days, the caterpillars revive on the leaves until they reach the second or third centuries, after which, approximately in August, they go to wintering places. One generation develops per year.

The main harm, which leads to significant crop losses, caterpillars are applied in spring, damaging the kidneys when they are numbing and blooming. Mass reproduction of pests is focal in nature. This is due to the fact that butterfly butterflies do not fly long distances.

The number of grape motley is reduced by ground beetles, coccinellids, goldfish, predatory bugs, larvae of syrphid flies, spiders.

Protective measures. Tillage during caterpillar pupation. With a population of more than 2-3 caterpillars per bush – spraying with biological products or insecticides.

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