Insecta, Coleoptera, Curculionidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: pear and, much more rarely, apple.
- Adult: it emerges in spring and nibbles the petioles, the young leaves and the tree shoots. It moves about generally by walking, but sometimes flies from tree to tree. It passes through a summer diapause, sheltered under the bark on trees or in other varied situations. When its activity resumes, it flies relatively often and feeds especially by nibbling the lower part of the leaf buds.
Laying begins 12 to 15 days after its emergence: the female perforates the flower buds with her rostrum and deposits an egg at the bottom of the cavity (*) . She then obscures the oviposition hole with a yellowish air-hardening substance.
Average fecundity: 12 to 15 eggs.
- Larva: newly emerged larvae feed on the future floral structure inside the bud (*) and then pupate in situ.
- 1 annual generation.
- The eggs laid in autumn inside the buds hatch at the end of the winter and at the beginning of spring. The larvae develop at the expense of flower buds. The new adults emerge in April-May. They are very active for 5 to 6 weeks. After an aestivation period, activity resumes in September and oviposition occurs. Some beetles may overwinter; they oviposit in the spring.
- In autumn, the feeding punctures at the base of the leaf buds can reach the woody bunch of fibres and cause partial or total desiccation of the bud.
- The flower buds attacked by the larvae do not open at all or sometimes do so irregularly and desiccate before or at the time of full flowering (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.