Oak bark beetle
| Oak bark beetle | ||||||||||||
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Oak beetle ( Scolytus intricatus ), male, magnified 20 times. |
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| Scientific name | ||||||||||||
| Scolytus intricatus | ||||||||||||
| ( Ratzeburg , 1837) |
The Eichensplintkäfer ( Scolytus intricatus ) is a weevils 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.
features
The beetles are 2.5 to 3.5 millimeters long and have a black, cylindrical body. The pronotum is large and narrowed in front, the base and sides are edged. Seen from above, it does not cover the head. The forehead of the male beetle is flat and briefly covered in yellowish hair, with two long, thin brushes of hair over the mandibles . The forehead of the female beetle is arched and not very hairy ( sexual dimorphism ). The red-colored elytra have uniform rows of dots with about the same size dots. The points of the pronotum are small, dense and never fused into longitudinal wrinkles. The antennae and legs are yellow-red.
distribution
The species is common in Europe. In the north, the species is not found in the southern Swedish highlands.
Way of life
The oak sapwood beetle occurs mainly on oaks ( Quercus ), occasionally also on willows ( Salix ), poplars ( Populus ), elms ( Ulmus ), red beeches ( Fagus sylvatica ), hornbeams ( Carpinus betulus ), European hop beech ( Ostrya carpinifolia ), common Horse chestnut ( Aesculus hippocastanum ), sweet chestnut ( Castanea sativa ) and hazel species ( Corylus ). It colonizes the bark of the trees, also in the area of the bark . The feeding pattern is a relatively short, one to three centimeter long, one-armed mother's passage (transverse passage), which deeply furrows the sapwood. The larval ducts branch off laterally upwards and downwards. They can also be clearly seen in the splint. The beetle eats at the base of the youngest shoots, which often break off.
One or two generations are trained each year; the flight time is from late May to June and in September.
Systematics
Synonyms
The following synonyms are known from the literature :
- Eccoptogaster intricatus Ratzeburg, 1837
- Scolytus lenkoranus Eggers, 1942
- Scolytus penicillatus Reitter, 1913
- Eccoptogaster picicolor Stephens, 1830
- Scolytus simmeli Eggers, 1923
- Scolytus tiburtinus Claus. 1958
swell
Individual evidence
- ^ Scolytus intricatus (Ratzeburg 1837). Fauna Europaea, Version 1.3, April 19, 2007 , accessed on September 16, 2008 .
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
