Twelve-toothed pine bark beetle
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Twelve-tooth pine bark beetle ( Ips sexdentatus ) |
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| Ips sexdentatus | ||||||||||||
| ( Borner , 1776) |
The twelve-toothed pine bark beetle ( Ips sexdentatus ) 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.
features
The beetles are 5.5 to 8.2 millimeters long and have a brown, cylindrical body. The pronotum obscured when viewed from above the head. The wing covers have a sloping slope, which forms a flat hollow. The edge of the fall is covered with teeth. The fourth, largest, which is button-shaped at the end, follows three conical teeth. Two more conical teeth follow this until the edge of the wing cover completes the fall. The antennae is five-limbed. The male animal has stronger teeth on the wing-cover lintel and a stronger frontal hump, and the seventh sternite in the middle has shorter hair than that of the female animal.
distribution
The species is common in Europe.
Way of life
The twelve-toothed pine bark beetle is a polygamous bark breeder on conifers. It occurs mainly on the common pine ( Pinus sylvestris ), occasionally also on the black pine ( Pinus nigra ), snake skin pine ( Pinus leucodermis ) and maritime pine ( Pinus pinaster ), rarely on silver fir ( Abies alba ), Nordmann fir ( Abies nordmanniana ), European larch ( Larix decidua ), Siberian larch ( Larix sibirica ), Norway spruce ( Picea abies ) and Caucasian spruce ( Picea orientalis ). It also colonizes the bark of the trees in the area of the bark . The feeding pattern is formed by two- to four-armed longitudinal passages that start from a ramming chamber and are up to 50 centimeters long. The larval ducts that branch off to the side are relatively short. Two generations a year can be educated. The flight time is in April / May and July / August. The animals love warmth and thick trunk parts. They have 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 made unfit for brood (burned or treated with chemical agents approved for this purpose).
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
Web links
http://www.forestryimages.org/search/action.cfm?q=Ips%20sexdentatus&Start=1&results=81