Insecta, Coleoptera, Curculionidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: legume plants, particularly lucerne.
- Adult: the young adult flies at the beginning of summer and feeds by gnawing the leaves and shoots of legume plants. Egg laying begins in autumn and continues into the spring, after an overwintering period.
The eggs are laid in small cavities formed by the female at the base of the lucerne stems.
Average fecundity, 600 to 800 eggs.
- Egg: embryonic development lasts 15 days to 2 months according to the temperature.
- Larva: the young larvae move towards the buds where they shelter and feed. Older larvae devour the leaf lamina, leaving the veins. When fully grown, each pupates in a loose cocoon spun on the leaves.
- 1 annual generation with 2 oviposition periods (autumn and spring) which can differ depending on the regions. The autumn egg layings period is the more important. Overwintering can occur in the adult, pupal, larval or egg (in the case of late egg laying) stages.
The larvae feed on the buds and are particularly harmful to lucerne seed-crops (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.