Insecta, Coleoptera, Byturidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- The adults feed on raspberry and blackberry (Rubus), more rarely on hawthorn (Crataegus), apple, pear, strawberry.
The eggs are deposited only on Rubus.
- Adult: feeds on buds (*) , very young leaves and especially pollen when the temperature reaches 16-18°C. The female lays eggs from May to July at a rate of 2 to 3 per day at the beginning of the period, then in a sporadic way. Average fecundity: 100 to 120 eggs.
- Egg: deposited for preference in flowers of which the fruit is almost formed. Embryonic development lasts about 8 days.
- Larva: gnaws the base of the receptacle then digs sinuous galleries in the young fruit and eats the drupes (*) . Development lasts 35 to 45 days. It then drops to the ground, buries itself (2 to 10 cm) and builds a nymphal shell where it hibernates in the larval or adult state.
- 1 annual generation.
- The adult is present from end of April until the beginning of September.
- The adult perforates the flower buds to reach the stamens.
- By attacking the young growing fruit, the larvae cause their deformation, a slowing down of the drupe's growth, an abnormal coloration and sometimes if several larvae are present at the base of the fruit, their drying up (*) .
In Germany, the adults are active from early May to August. Egg laying commences in June. Overwintering occurs mainly above ground, after pupating in cocoons incorporationg pieces of vegetation, and in only a fex cases as larvae in cocoons incorporating soil particles (5-30 cm below ground level).
The beetle is one of the most important pests of raspberry in shady locations.
DE: Himbeerkäfer ES: Gusano de las frambuesas FR: Ver des framboises IT: Verme del lampone PT: Lagarta das framboesas GB: Raspberry beetle
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.