Pest Type: Fruit Pest
Row: Coleoptera – Coleoptera
Family: Pipe Twigs – Attelabidae (Rynchitidae)
It is found everywhere. It damages the apple tree, plum, less often the pear, apricot, peach, thorns, cherries, cherries.
Beetle 4-6 mm long, with rostrum 7-10 mm, raspberry black with violet-green luster; rostrum, antennae and tarsi dark purple, body covered with sparse dark hairs; the head with the eyes is wider than its length; pronotum equal in length to width; elytra longer than its width, with regular shallow specks of grooves. Egg size 0.9-1.2 mm, oval, milk-milk. Larva – 7-9 mm, yellow-white, somewhat curved, without legs, head dark brown. Pupa 6–9 mm long, white with yellowness, covered with sparse hairs, chitin fork on the last segment.
Larvae hibernate in soil and immature beetles in cracks of the bark and under fallen leaves. In the spring, at the beginning of kidney swelling, at an average daily temperature of 6-8 ° C, beetles rise in the crown of trees and begin feeding. The exit of beetles from wintering sites ends before the flowering of the apple tree. 6-8 days after flowering, the beetles mate and begin to lay eggs. The female gnaws a hole 2-3 mm deep in the fetal ovary and lays the egg at the bottom, covering it with bits and pieces of excrement. Along with the egg chambers, it gnaws the second chamber and causes superficial damage to the skin, while introducing fruit rot into the pulp of the fetus. In addition, after laying eggs, the female gnaws the stem, which accelerates the fall of the fetus. The life span of beetles is 60-80 days. The fertility of the female is up to 200 eggs.
Pest egg laying ends in the second half of June, in the forest-steppe – at the end of July. After 8-9 days, larvae are regenerated from the eggs, which feed on the rotting pulp of the fetus. If the fruit does not rot, the larva dies, and cork warts form at the site of egg deposition.
Nutrition of the larva lasts 25-36 days, after which it leaves the fruit and passes into the soil to a depth of 8-16 cm, where the larvae that developed in the fruits of the apple tree pupate up to 50%, and among the larvae that develop in the fruits of the plum, more than 80%.
The larvae started to snooze, after 16-18 days they turn into beetles that come to the surface and feed on buds, fruits, and young shoots until late autumn. With the onset of cold weather, they move to winter places. Larvae remaining in the soil, which fall into diapause and pupate in July – August of the following year. Thus, one part of the goose individuals have an annual second – two-year generation.
Protective measures. Collection and destruction of rotting fruits. Cultivation during mass pupation of larvae and in late autumn after leaf fall. With a population exceeding 7-8 beetles per tree, the use of insecticides in the phonophoresis of bud isolation.