2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The pear flower beetle mainly damages the developing pear buds (in this case, the larvae harm the buds, and the bugs actively feed on the leaves). These pests are monophages: the main and only fodder tree for them is the pear. And you can meet gluttonous parasites literally everywhere where pear trees grow. Massive outbreaks of their reproduction often lead to the death of a significant part of the pear harvest, and sometimes it can die entirely
Meet the pest
The pear flower beetle is a small brownish ovate-oblong beetle, the body length of which reaches 4.5 mm. The heads of voracious parasites smoothly transform into thin, long and slightly curved rostrum. Moreover, in females, the rostrum is longer than in males. Quite wide white stripes covered with very dense hairs run across the elytra of the pests, and the third interval of the grooves located on the elytra is equipped with a black-hairy slightly convex tubercle and is slightly widened. The thighs of pear flower beetles are dark, and the legs and antennae are brownish yellow.
White eggs of harmful parasites differ in ellipsoidal shape and reach 0.7 - 0.8 mm in size. As a rule, they are placed by females in the fruit buds of pears. Small white larvae of pear flower beetles grow in length up to 5 - 6 mm. They are quite thick, slightly curved, completely devoid of legs and endowed with tiny brownish heads. And the length of the yellowish-white pupae is about 4 - 5 mm.
With the onset of May, adults of pear flower beetles begin to emerge from the tiny pear buds. They go outside, gnawing characteristic holes in the kidneys, and for about five weeks they actively feed on the leaves. After that, the bugs leave the tree crowns and move to the cracks in the bark or to other secluded places. And at the beginning of autumn, with the onset of September-October, the bugs come out of their hiding places again.
Mating of pear flower beetles always ends with the laying of eggs and the subsequent withering away of harmful beetles. Roughly in the first half of autumn, females gnaw out rather deep pits in pear fruit buds, into which they will subsequently lay eggs. In this case, one egg is laid in each kidney, and the total fertility of the pests is about two dozen eggs. The duration of embryonic development is only a few days (maximum a week). And sometimes eggs can remain in the kidneys until spring, but this happens extremely rarely. The larvae that emerge from the eggs remain hibernating in the kidneys.
In early spring, approximately in April, harmful parasites wake up from sleep and begin to intensively feed inside the kidneys. As a result, they almost completely gnaw out all their internal parts, and with the onset of May they immediately pupate. Without leaving the buds, pupae are transformed into adult insects in just a few days. And in the midst of May, the emergence of adults is already observed.
How to fight
During the period of swelling of tiny buds, as well as during their blooming, bugs can be shaken off the pear trees onto the litter spread in advance. In this case, the column of the thermometer should not rise above ten degrees, otherwise the harmful bugs will immediately begin to scatter in all directions. Then all the pests that have fallen on the litter are poured with water to which kerosene has been added.
In late autumn, it is necessary to dig up the soil under all the pear trees. In addition, all affected leaves with fruits should be removed from the trees and promptly destroyed.
As for insecticides, Ambush, Metaphos, Korsar, Vofatox, Aktellik, etc. will be the most suitable for combating pear flower beetles. It is necessary to carry out treatments with these means before pear blossoming.
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