Insecta, Coleoptera, Curculionidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: very polyphagous, the adults feed on, for example, vine, raspberry, strawberry. The larvae gnaw the roots of vine, strawberry, aster (Callistephus), phlox (Phlox), peony (Paeonia) and glasshouse plants such as cyclamen (Cyclamen), begonia (Begonia), primula (Primula) and cineraria (Senecio).
- Adult: it emerges in spring and lives on average 15 to 17 months. It hides during the day and moves about the plants at nightfall, biting deeply into the buds (*) and the leaves, lacerating the vine boughs. Males are rare and reproduction is almost entirely parthenogenetic. Egg laying starts 50 to 100 days after the adults have emerged, the eggs being deposited on the ground (*) . Average fecundity, 70 to 280 eggs.
- Egg: embryonic development lasts about 20 days.
- Larva: they bury themselves deep in the ground, decorticating small roots, wounding the large ones. Growth lasts from 9 months to two years.
- 1 generation every 2 to 3 years depending on the region and the weather conditions.
- The adults emerge in spring and the females lay eggs during the summer, autumn and all the next year. They spend a winter in the ground and under various shelters. They die at the approach of the next winter. The larvae hibernate once or twice before pupating in spring.
- On vines, the larval attacks on the roots often coincide with those of the adults which cut the new buds and the bunches of grapes and can lead to prevention of development of inter-nodes.
- In glasshouses, larval attacks on roots cause the decline and death of plants.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.