Colorful ash bark beetle
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Colorful ash beetle ( Leperisinus varius ) |
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| Leperisinus varius | ||||||||||||
| ( Fabricius , 1775) |
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| Side view | front | bottom | Top |
The colorful ash beetle ( Leperisinus varius now Hylesinus fraxini ) is a weevil from the subfamily of the bark beetle (Scolytinae). Since it creates its breeding systems in the bark of the host trees, it is counted among the bark breeders. The species is distributed in Europe to the Urals.
features
The beetles are 2.5 to 3.5 millimeters long and have a cylindrical body. The pronotum is granular in front and does not cover the head when viewed from above. The upper side of the body is covered with spotty, yellow-brown, superimposed scales, to which the species owes its German name. The wing top sides have fine, regular rows of dots made of small depressions. There are small bumps on the wing cover base in the second space between the rows of dots. The remaining spaces have rows of grains. The antennae is seven-limbed. The antenna lobe is long, pointed and has two weak seams. The male has eight tergites on the abdomen, while the female only has seven.
Way of life
The colorful ash beetle is found mainly on the common ash ( Fraxinus excelsior ), Fraxinus ornus , Fraxinus americana , occasionally on the olive tree ( Olea europaea ), walnuts ( Juglans ), Quercus pedunculata , pears ( Pyrus ), apples ( Malus ), common robinia ( Robinia pseudoacacia ), beeches ( Fagus ), maples ( Acer ), common hazel ( Corylus avellana ), hornbeam ( Carpinus betulus ) and lilacs ( Syringa vulgaris ). It colonizes the bark of the trees, also in the area of the bark . The feeding picture has a relatively short, vertical entrance tube, from which a horizontal, double-armed transverse passage branches off (staple passage). The larval ducts run more or less vertically, densely packed and are usually only four centimeters short. The dolls' cradles and the corridors run partly in the sapwood and are very easy to recognize after the bark has fallen off. The beetles carry a under green bark in the crown or in young rods maturation feeding through. This first leaves small, cancerous spots, then creates bark growths that are called "beetle bark" or incorrectly called "ash rose". The animals overwinter in these growths. One generation develops each year, the flight time is from March to May, from 16 ° C air temperature. The new generation appears in July and August. Often the animals appear in large numbers.
literature
- Fritz Schwerdtfeger : The forest diseases. Textbook of forest pathology and forest protection . 4th, revised edition. Parey, Hamburg and Berlin 1981, ISBN 3-490-09116-7
- Sabine Green : Manual for the determination of the European bark beetle Verlag M. & H. Schaper, Hanover 1979, ISBN 3-7944-0103-4
- Edmund Reitter : Fauna Germanica - The beetles of the German Empire. Volume 5, KG Lutz, Stuttgart 1916
- Edmund Reitter: Fauna Germanica - The beetles of the German Empire. 5 volumes, Stuttgart KG Lutz 1908 - 1916, digital library volume 134, Directmedia Publishing GmbH, Berlin 2006, ISBN 3-89853-534-7
