Furrowed spruce bark beetle
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Furrowed spruce bark beetle ( Pityophthorus pityographus ), female |
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| Pityophthorus pityographus | ||||||||||||
| ( Ratzeburg , 1837) |
The furrowed spruce bark beetle , also furrowed spruce bark beetle ( Pityophthorus pityographus ) 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 1.1 to 1.5 millimeters long and have a dark brown body. The head is not visible from above, the uniformly arched pronotum is longer than it is wide, with concentrically lined cusps at the front, dotted at the back and finely rimmed at the base. The front edge has a fine crown of cusps. The wing covers , which are provided with strong point stripes, have a deep, wide furrow next to the seam, which only begins in the last third. The seam and furrow have individual hairs on the edges that arise from small grains. The tip edge of the elytra is simple and immediately encompasses the abdomen . The antennae is severely cut by seams and about 1.5 times as long as it is wide, the antennae is five-parted. The eyes are slightly kidney-shaped. The third foot member is cylindrical in shape. The antennae and tarsi are lighter than the body. The female wears a dense, yellowish, forward-facing hairbrush on her forehead, which even protrudes above the pronotum. The male lacks such a hairbrush.
distribution
The species is distributed in Central Europe , Poland , the Czech Republic , Slovakia , Bulgaria , Romania , the former Yugoslavia , Ukraine , the Crimea and the Caucasus .
Way of life
Pityophthorus pityographus comes spruce ( Picea ), rarely on pine ( Pinus ), white fir ( Abies alba ), Nordmann fir ( Abies NORDMANNIANA ), European larch ( Larix decidua ), Douglas fir ( Pseudotsuga menziesii ) and Canadian hemlock ( Tsuga canadensis ) in front. It colonizes the bark of trees, primarily in branches, twigs, tree tops and young plants. The animals are polygamous .
The four to seven-armed, star-shaped, mostly horizontal, two to five centimeters long and 0.5 to 0.7 millimeter wide mother tunnels of the brood pattern are located in the bark and also intervene in the sapwood of the trees. You are assuming a bunkhouse . On the inside of the bark, the larval ducts can be seen, which are arranged widely. There are one to mostly two generations a year whose flight times are in May and July / August.
Harmful effect
The beetle can contribute to the death of parts of the crown or of young trees. However, this is rarely associated with real economic damage, so that control is not necessary. An infestation is usually not recognized quickly and the beetles are only found after a targeted search in ailing material.
Systematics
Synonyms
The following synonyms are known from the literature for Pityophthorus pityographus :
- Pityophthorus micrographus Gyllenhal, 1813
- Bostrichus abietiperda Thiersch, 1830
- Bostrichus pityographus Ratzeburg, 1836
- Pityophthorus pityographus var.cribratus pepper, 1940
- Pityophthorus pityographus var. Bibractensis Balachowsky, 1949
swell
Individual evidence
- ^ Pityophthorus pityographus (Ratzeburg, 1837). Fauna Europaea, Version 1.3, April 19, 2007, accessed on February 12, 2016 .
literature
- Sabine Grüne : Handbook for the determination of the European bark beetles. M. & H. Schaper Verlag, Hannover 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 .
