Description, Biology, Life Cycle, Damage, Common Names, Images
- 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.
- 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 (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.