Large larch bark beetle

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Large larch bark beetle
Larch bark beetle top view.png

Large larch bark beetle ( Ips cembrae )

Systematics
Order : Beetle (Coleoptera)
Subordination : Polyphaga
Family : Weevil (Curculionidae)
Subfamily : Bark beetle (Scolytinae)
Genre : Ips
Type : Large larch bark beetle
Scientific name
Ips cembrae
( Army , 1836)
Larch bark beetle (measured with microscope)
Breeding courses of the large larch bark beetle

The large larch bark beetle ( Ips cembrae ), also known as the eight-toothed larch bark beetle , belongs to the subfamily of the bark beetle (Scolytinae). There it is assigned to the bark breeders.

features

The beetles reach a length of five to six millimeters and are very similar to the book printer ( Ips typographus ) in appearance and way of life. The drop of the elytra is bevelled and shaped almost identically in the males and females. The curved tip edge is somewhat flattened horizontally, smooth-edged, not notched and edged on the inside. The first space at the seam before the fall is filled with a number of small grains. The seams of the antenna lobe are curved, the seam of the basal segment of the antenna lobe is strongly curved in the middle. The forehead is quite dull and dull in both sexes, more pronounced in the female and less granular in the male. Frontal cusps are not developed. The pronotum is somewhat longer than it is wide, parallel behind, more elliptically rounded in front, weaker and more scaly granulated above. The fall of the wing-coverts is long hairy along the seam and the front sides and scattered dotted and shiny at the base.

The larvae are white, legless and slightly curved.

Similar species

  • Ips amitinus (Eichhoff, 1871): Shiny fall, straight antenna lobe seams.
  • Ips duplicatus (Sahlberg, 1836) Distance between the first and second tooth twice as large as between the second and third.
  • Ips acuminatus (Gyllenhal, 1827) dotted spaces, in males third and fourth teeth fused at the base, females only with three teeth on the edge of the fall.
  • Ips sexdentatus (Börner, 1776) Six teeth on each side of the fall.
  • Ips typographus (Linnaeus, 1758) Crash at the end of the wing cover, dull and loosely dotted, with 4 + 4 teeth of different sizes and shapes on the edge.

Occurrence

The large larch bark beetle can be found on the Swiss stone pine in Central and Southern Europe and on the European larch ( Larix decidua ) in northern Central Europe . The species is found at altitudes from 400 to about 2000 meters. In the lower, thick-barked part of the trunk, it often occurs together with the larch goat ( Tetropium gabrieli ).

Way of life

Under favorable climatic conditions and in low-lying areas, the beetle forms two generations a year, which appear from late April to May and mid-July to mid-August. The species overwinters either as a larva in the bark of the tree or as an imago in the litter.

The feeding pattern is similar to that of Ips amitinus , but it is larger and thicker. Drill holes are located in the trunk area. Usually three or more armed, 6 to 18 centimeters long star corridors are created, which are provided with a few ventilation holes. The regeneration feeding of the mother beetle connects to the mother tunnels.

Forestry importance

The Great larch bark beetle colonized unlike its nearest relatives and thin trunks so that in dry years the areal death of pole wood holdings of larch can come.

swell

Individual evidence

  1. ^ A b Edmund Reitter: Fauna Germanica - The beetles of the German Empire. Volume 5, KG Lutz, Stuttgart 1916, p. 304.
  2. ↑ a b c d e Jiři Zahradník, Irmgard Jung, Dieter Jung et al .: Käfer of Central and Northwestern Europe . Parey, Berlin 1985, ISBN 3-490-27118-1 .
  3. ↑ Large eight-toothed larch bark beetle - Ips cembrae. Federal Research and Training Center for Forests, Natural Hazards and Landscape, accessed on August 16, 2008 .
  4. ↑ a b Dagmar Nierhaus-Wunderwald: The large larch bark beetle. Biology, monitoring and forest measures. Merkbl. Practice. 24, 1995, 6 pp., ISSN  1422-2876 .

literature

  • 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 .
  • Fritz Schwerdtfeger : The forest diseases. Textbook of forest pathology and forest protection. 4th, revised edition. Parey, Hamburg / Berlin 1981, ISBN 3-490-09116-7 .
  • Wolfgang Schwenke (Hrsg.) Among others: The forest pests of Europe. A manual in 5 volumes.

Web links

Commons : Large larch bark beetle ( Ips cembrae )  - Collection of images, videos and audio files