Beech weevil

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Beech weevil
Adult beech weevil

Adult beech weevil

Systematics
Subfamily : Curculioninae
Tribe : Rhamphini
Sub tribus : Rhamphina
Genre : Orchestras
Subgenus : Salius
Type : Beech weevil
Scientific name
Orchestes fagi
( Linnaeus , 1758)
Orchestes fagi up.jpg Orchestes fagi front.jpg
Orchestes fagi side.jpg Orchestes fagi under.jpg
Different views

The Buchenspringrüssler ( Orchestes fagi ) is a beetle from the family of weevils (Curculionidae). The beetle lives on European beeches and can be very common there.

features

The adult beetles are 2 to 2.5 millimeters long. They are black-brown in color and show fine, gray hair. The legs and antennae are colored red, the latter are pivoted in the middle of the trunk. The hind legs are thickened on the thighs. The larva is white, legless, eyeless and curved belly.

ecology

Eating picture of the beech weevil at the end of June (approx. 900 m above sea level)

The beech weevil lives on red beech. Its flight time lasts from April to September, the generations are annual.

It tends to multiply in beech areas, which causes damage to forestry. After wintering under the bark of a beech tree or in the ground, the beetle's pitting can be seen on the still young beech leaves. Leaf stalks are also eaten, the leaves fall off a short time later. The eggs are later laid individually on the underside of the leaf on the midrib. Between May and June the larva eats a channel in the midrib, from which a gangue mine is created between two side ribs, which turns into a space mine after reaching the leaf edge , where the larva pupates in a spherical cocoon at the end of May / beginning of June . If the infestation is severe, the leaves turn brown, and the damage is reminiscent of late frost damage. There is also crown defoliation. With severe infestation, crowns and stand margins appear brownish from a distance.

Damage relevant to forestry arises from the destruction of assimilation mass, resulting in measurable incremental losses. The reproduction of beech trees can also suffer, as drilling into the ovary makes the beech nuts sterile. Countermeasures are expensive due to the resistance of the beetles and only make sense in beech rejuvenation and fruit tree crops (which are sometimes also infested).

Taxonomy

The following synonyms can be found in the literature :

  • Rhynchaenus fagi ( Linnaeus , 1758)

Individual evidence

  1. ↑ a b Wolfgang Schwenke: Guide to forest zoology and forest protection against animals . Parey, Hamburg, 1981. ISBN 3-490-06816-5 . P. 86
  2. ↑ a b c d Stefan Ebner and Andreas Scherer: The most important forest pests. Insects, mushrooms, small mammals. Leopold Stocker Verlag , Graz, Stuttgart 2001. ISBN 3-7020-0914-0 . Pp. 110-112
  3. ^ Günter Hartmann, Franz Nienhaus and Heinz Butin : Color atlas forest damage . Diagnosis of tree diseases. 2nd revised and expanded edition. Ulmer, Stuttgart 1995, ISBN 3-8001-3351-2 , p. 207
  4. ↑ Markus Schardt, Bernhard Fauster, Axel Gruppe & Reinhard Schopf: Influence of leaf position on frequency of infestation and developmental success of Rhynchaenus fagi L. (Coleoptera: Curculionidae) on beech (Fagus sylvatica L.) . Announcements of the German Society for General and Applied Entomology (DGAAE) No. 15, pp. 41–44, available online (PDF file; 344 kB)

Web links

Commons : Japanese beech weevil ( Orchestes fagi )  - Collection of images, videos and audio files

literature