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Oberea linearis (L.)
Insecta, Coleoptera, Cerambycidae .

Hazel longhorned beetle

Description, Biology, Life Cycle, Damage, Common Names, Images

- Adult: 11 to 16 mm, entirely black, very narrow. Quite thick antennae, not longer than the body. Bulging prothorax; yellow legs and base of the elytra (*) .
- Larva: 20 mm, white.

- This beetle attacks hazel, more rarely walnut, hornbeam (Carpinus betulus), alder (Alnus), willow (Salix).
- Adult: appears in spring. The female lays eggs singly under the bark of the 1 year old twigs of the host trees (*) .
- Larva: first digs a circular gallery, perpendicular to the wood fibres; the gallery is subsequently orientated from top to bottom and can reach a length of 40 to 60 cm (*) . The larva hibernates in the gallery then, the next spring, bores a descending gallery; at the end of the autumn, it makes a chamber inside the base of the branch in which it will later pupate.

[R]Life Cycle
- 1 generation every two years.
- The larva does not leave its gallery and overwinters there twice. After the second hibernation, it pupates in April and the adults appear in May-June.

The digging of the circular gallery in hazel is accompanied by the formation of a ring-like protuberance, and brings about, in autumn, the drying up of the bough and its splitting (*) .

[R]Common Names
DE: Haselbock ES: Cerambícido del avellano FR: Capricorne du noisetier IT: Cerambice del nocciolo PT: Broca das aveleiras GB: Hazel longhorned beetle

[R] Images

  1. Oberea linearis (L.) (Coutin R. / OPIE)
    Adult resting under a hazel leaf
  2. Oberea linearis (L.) (Coutin R. / OPIE)
    Laying injury In a branch of hazel of the current year.
  3. Oberea linearis (L.) (Coutin R. / OPIE)
    Larva in a branch of hazel The young branch has been opened to show the larva at its centre.
  4. Oberea linearis (L.) (Coutin R. / OPIE)
    Damage on hazel The leaves of the shoot dry up.

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