Large Pear Elephant

Large Pear Elephant

Pest Type: Fruit Pest

Row : Coleoptera – Coleoptera

Family: Pipe Twigs – Attelabidae (Rynchitidae)

It is found in the steppe and forest-steppe of Russia. It damages a pear, apple tree, plum, cherry, apricot, hawthorn.

Beetle 7-10 mm long, black-raspberry with a greenish tint, eyes slightly convex; the rostrum is parallel with a thin longitudinal keel, disappears to the apex; antennae, paws and apex of the head of the tube dark brown; the shield is quadrangular, small, with a depression in the middle; elytra one and a half times longer than shoulder-width, with large specks, grooves, whole body in sparse light hairs. Egg size 1-1.2 mm, white, oval. Larva – 10-12 mm, white with a slight yellowish tint, curved arcuate; the dorsal side is covered at the edges of the segments with sparse blond hair, the chair is brown-brown. Pupa 9–14 mm in size, white, with sparse hairs; two brown spines on end of the abdomen.

Beetles and larvae hibernate in the soil. In the spring, during the budding period, the bugs leave the soil and additionally feed. Live 2-2.5 months. Usually, at the end of May, mating and laying of eggs begin. The female gnaws a deep hole in the pear fruit, lays an egg at the bottom, and covers it with bits of peel. After that, circular sinuous grooves eats around the egg chamber on the surface of the fetus and gnaws the peduncle, as a result of which the fetus withers and falls prematurely. Fertility – up to 100 eggs. Revived after 8-11 days, the larva eats within the fetus for 30-40 days. After the development is completed, it leaves the fetus and passes into the soil, where, at a depth of 10-15 cm, it makes an earthen cradle. In this crib, the larva is until the fall of next year. In August-September, the larva pupates and a beetle form.

Thus, the development of a large gurukul is completed within two seasons. Beetles damage buds, leaves, flowers, green shoots, and fruits. Larvae feed on seeds and pulp of fruits. The first scavenger, populated by larvae, appears already in early June, massive – in late June – the first half of July.

Protective measures. Systematic collection and destruction of carrion. Tillage during the period of mass migration of larvae into it and in autumn during pupation. With a population that exceeds 8 beetles per tree, spraying with insecticides 4-6 days after the end of flowering.

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