2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The pear bug willingly feasts on not only a pear, but also a hawthorn with an apple tree. Sometimes it damages some other fruit crops, but this does not happen often. Its larvae are especially harmful, sucking all the juices from the delicate leaves. As a result of the harmful activity of these parasites, the leaves are gradually discolored and rather heavily contaminated with molted skins and sticky excrement of pests. In dry seasons, the harmfulness of pear bugs is especially high. If the trees were damaged quite badly, then they stop their growth, their winter hardiness is significantly reduced, the leaves on them dry out and fall off, and the fruits become noticeably smaller and also often fall off
Meet the pest
The size of adults of pear bugs is from 3 to 3.5 mm. The round flat body of the pests is equipped with a comb-like rise in the middle, and bizarre leaf-like outgrowths can be observed on the sides of their prothorax. The light elytra of the parasites are decorated with a lace pattern and are leaf-like widened. The eyes of pear bugs are red, the antennae are thin and long, and their tiny legs are painted in light yellow tones. In addition, all females are endowed with ovipositor consisting of a pair of dusty processes.
The size of gray oblong eggs of pear bugs reaches 0.4 mm. The eggs of the pests are slightly pointed towards the tops and are bulb-like curved. The oblong, whitish, flat larvae grow from 0.6 to 2.3 mm in length and are endowed with tiny brownish heads. And on the sides of their bodies are long and thin spines.
Immature adults overwinter in cracks in the bark and in the middle of fallen leaves. Most often they can be found in numerous forest plantations. Bedbugs leave their wintering places quite late, after the leaves of pears with apple trees bloom. You can notice them on trees in the southern regions already in late April or early May, and in the forest-steppe zone - closer to mid-May. When warm weather is established, these funny pests are able to fly over very substantial distances. All bugs immediately start additional feeding, sucking the juices from the delicate leaves.
The lifespan of wintering females is quite long - this explains the fact that the egg-laying process lasts from one and a half to two months. And the total fertility of pests reaches two hundred to three hundred eggs. They lay eggs on the undersides of the leaves in compact groups, each of which contains from seven to ten eggs. And the ovipositor helps females to introduce them into the leaf tissue. In the south, the duration of embryonic development of pear bugs is from twenty to twenty-eight days, and in the forest-steppe - from twenty-eight to thirty-five days.
In the southern regions, closer to mid-June, there is a massive revival of gluttonous larvae. In the forest-steppe, it usually falls in July. The reborn sedentary larvae accumulate on the lower sides of the leaves in rather tight groups and suck out all the juices from them. After some time, whitish spots form in such areas. For twenty-twenty-five days of its development, each larva manages to pass six centuries.
In the forest-steppe zone, the emerging adults continue their feeding, and as soon as the cold sets in, they go to wintering places. And individuals living in the steppe zone give the second generation, which develops in July and August.
How to fight
Fallen leaves should be promptly raked up and promptly burned, and dead bark should be systematically cleaned off. If for every hundred leaves there are more than two hundred larvae and nymphs of the first generation, as well as more than three hundred larvae of the second generation, fruit trees should be treated with insecticidal preparations. In this case, special attention should be paid to the lower sides of the leaves - it is there that the bulk of adult bugs and their larvae are located.
In the years of especially massive reproduction of pear bugs, arthropod predators, mainly bugs, help to reduce their number to a large extent. The laid eggs of gluttonous parasites often infect horsemen, and a significant part of the harmful larvae die when humid weather sets in from bacterial and fungal ailments.
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