Brown spruce buck
|Brown spruce buck|
Brown Spruce Bock ( Tetropium fuscum )
|Fabricius , 1787|
The brown spruce Bock ( Tetropium fuscum ) is a beetle of the family of longhorn beetles (Cerambycidae). Together with the related and very similar common spruce sapling buck ( Tetropium castaneum ), it is a conifer pest for forestry.
The larvae are 15 to 25 mm long. The adults are 9 to 18 mm long and vary in color. The head and the round pronotum are black. The legs are light brown, only the thighs are darker in color.
The animals are native to all of Europe up to the Urals. They occur from the lowlands to the low mountain range, but are rare. They live in coniferous forests, in Central Europe they prefer spruce forests , in South and Southeastern Europe they can also be found in pine stands . They are often associated with the common spruce sapling buck. The beetle has already become naturalized in Japan and Canada through spreading . In Halifax (Nova Scotia) in particular, it causes damage to various softwoods. While the beetle mainly attacks weakened trees in its homeland, it also kills healthy trees in Canada.
Way of life
The females lay around 100 eggs in cracks in living, weakened or freshly felled conifers. The larvae hatch after about two weeks. At first they eat irregular tunnels under the bark . In autumn they drill a "hook passage" into the sapwood , which they stuff with sawdust. At the end of this they pupate.
In forestry, the brown spruce tree is considered a pest, as it makes the wood unusable as timber due to its hooked passages. The beetles hatch in May, often from coniferous wood that has already been used. However, it is not possible to lay eggs in this environment, as the larvae depend on fresh, barked wood. They bite an oval hole in the bark to get outside. Nothing is known about the food intake of the adults. The flight time is from May to August.
- Karl Escherich : The forest insects of Central Europe, second volume , Berlin 1923
- 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
- Wolfgang Schwenke (Ed.) Among others: The forest pests of Europe. A manual in 5 volumes. Volume 2: Beetles. Parey, Hamburg and Berlin 1974, ISBN 3-490-11016-1
- Pest Reports - EXFOR Database (English) ( Memento of the original from October 19, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- Damage occurrence in Canada (English)
- Tetropium fuscum in Fauna Europaea