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Gradual wilting of trees and shrubs as well as conspicuous drill holes in trunk and branches are indications for wood and Borkenschädlinge in the garden. Bark beetles (Scolytidae) are various species of beetles that attack plants as typical weakness parasites, especially after dry years or cold winters. The genus includes about 5,500 species.
Typical damage pictures
In addition to the typical "bark beetle" there are a variety of other wood and bark pests that can damage your plants in the garden. A well-known plant pest is, for example, the willow drill (Cossus cossus). He is a gray moth from the family of wood borers (Cossidae). His meaty red, after wood vinegar-smelling caterpillars are up to ten inches long and about one centimeter thick. Willow borers infest above all willow (Salix), birch (Betula), ash (Fraxinus) as well as apple and cherry varieties - but also buckthorn (Sorbus), oak (Quercus) and poplar (Populus) are often not spared. They detect an infestation of the approximately 15 millimeters in diameter wood aisles. From June check your plants for possible feeding damage. Cut damaged areas as early as possible with a sharp knife into healthy tissue.
Willow drill (Cossus cossus)
The blue-screened butterfly (Zeuzera pyrina) is also a butterfly of the wood-boring family. He stands out particularly by its white translucent wings, which are provided with blue-black spots. The whitish-yellow caterpillars of nocturnal moth grow up to six inches tall. An infestation occurs mostly on young trees, then arise in the heartwood of the affected plants up to 40 centimeters long aisles. Check your trees for infestation between July and September.
Blue-screened butterfly (Zeuzera pyrina)
Black-brown wing covers as well as a hairy breast shield are distinguishing features of the unequal wood borer (Anisandrus dispar). The animals also belong to the family of bark beetles, within these to the so-called wood breeders. The females are 3.5 millimeters tall, males, however, only 2 millimeters. Weakened fruit trees - especially apple and cherry - are particularly affected by an infestation. Maple (Acer), oak (Quercus), ash (Fraxinus) and other hardwoods are also attacked. There are only a few, about two millimeters large holes in the bark. Typical is the horizontal bore with strikingly sharp bends.
The 2.4-millimeter-sized fruit tree beetle (Scolytus mali) is a weevil from the bark beetle family. He has shiny gold wing covers, head and chest are black. The beetle occurs on apple, quince, pear, plum, cherry and hawthorn. They recognize the pest on the 5 to 13 centimeters long, vertically extending feeding passages directly under the bark.
The 5 millimeter long, black engraver (Pityogenes chalcgraphus) is a bark-breeding bark beetle. He catches the eye with his shiny reddish-brown winglets. The pest preferably populates conifers, mostly spruce and pine. This creates three to six star-shaped, up to six inches long aisles.
The Thuja bark beetle (Phloeosinus thujae) and the juniper bark beetle (Phloeosinus aubei) are about two millimeters tall, dark brown beetles. The pests infest various cypresses such as tree of life, cypress and juniper. Single, dead brown shoots of 5 to 20 centimeters in length, which are usually conspicuously kinked, indicate an infestation.
A treatment of pests with insecticides is not allowed in the house and allotment and in a Borkenkäferbefall also not promising, since the larvae are well protected under the bark and do not come into contact with the preparation.
Especially as already weakened plants are susceptible to wood and Borkenschädlinge, your plants should pour in stress situations such as drought on time. An optimal water supply and further care measures effectively prevent the infestation with bark beetles. Clear heavily infested trees from the beetle hatch in spring and remove them from your property to prevent further spreading.