Small eight-toothed spruce bark beetle
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Small eight-toothed spruce bark beetle ( Ips amitinus ) |
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| Ips amitinus | ||||||||||||
| ( Eichhoff , 1871) |
The small eight-toothed spruce bark beetle ( Ips amitinus ) 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. It is very similar to the book printer ( Ips typographus ) in appearance and feeding pattern.
features
The beetles are 3.5 to 4.8 millimeters long and have a dark brown, cylindrical body that narrows at the back. The pronotum obscured when viewed from above the head. The wing covers have a sloping fall, which forms a flat hollow, is shiny and clearly dotted. The edge of the fall has four teeth on each side, with the second and third teeth not fused at the base. The third, largest, is button-shaped at the end. Another conical tooth follows this until the edge of the wing cover completes the crash. The antennae is five-membered and the antennae sutures are straight. The male animal has stronger teeth on the wing cover and a stronger frontal cusp, and the seventh sternite in the middle has shorter hair than that of the female animal ( sexual dimorphism ).
distribution
The species is distributed in western , southern and eastern Europe , to the western part of European Russia .
Way of life
The small eight-toothed spruce bark beetle is a polygamous bark breeder on conifers. It occurs mainly on the common spruce ( Picea abies ), mountain pine ( Pinus montana ), Swiss stone pine ( Pinus cembra ), occasionally also on the silver fir ( Abies alba ) and the European larch ( Larix decidua ). It also colonizes the bark of the trees in the area of the bark . The feeding image is three to seven-longitudinal and star gears which from one to the inside of the cortex most visible Rammelstein chamber formed proceed. The larval ducts go off laterally. One or two generations are trained each year, the flight time is from May to July. The species has only a limited tendency towards mass reproduction.
Combat
Combating them is difficult because the animals will always have material that is suitable for breeding. If mass reproduction is suspected, all infected material must be destroyed or rendered unsuitable for brood (transported away, burned or treated with approved chemical agents).
Systematics
Synonyms
The following synonyms are known from the literature for Ips amitinus :
- Tomicus amitinus Eichhoff, 1871
- Bostrichus duplicatus Hlawa, 1870
- Ips duplicatus Hlawa, 1870
- Ips helveticus Schedl, 1932
- Ips montanus fox, 1913
- Ips amitinus var.montanus Fuchs, 1913
swell
Individual evidence
- ^ Ips amitinus (Eichhoff 1871). Fauna Europaea, Version 1.3, April 19, 2007 , accessed on September 21, 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 p. 303, 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
