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Byturus urbanus (Lindeman)
Byturus tomentosus

Insecta, Coleoptera, Byturidae .

Raspberry beetle

Description, Biology, Life Cycle, Damage, Common Names, Images


[R]Description
- Adult: 3.5 mm, large body. Relatively large head, 3-last segments forming a club, body entirely covered in a grey pubescence (*) .
- Larva: 5 to 6 mm, elongated relativaly flat, brown head, yellow body speckled with bristles with a large brown plate on each segment.

[R]Biology
- 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.

[R]Life Cycle
- 1 annual generation.
- The adult is present from end of April until the beginning of September.

[R]Damage
- 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 (*) .

[R]Remark/A>
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.


[R]Common Names
DE: Himbeerkäfer ES: Gusano de las frambuesas FR: Ver des framboises IT: Verme del lampone PT: Lagarta das framboesas GB: Raspberry beetle

[R] Images

  1. Byturus urbanus (Lindeman) (Coutin R. / OPIE)
    Adult on a raspberry bud
  2. Byturus urbanus (Lindeman) (Coutin R. / OPIE)
    Larva gnawing the base of the drupelets The fruit as been cut open in half.
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  3. Byturus urbanus (Lindeman) (Coutin R. / OPIE)
    Raspberry attacked by a larva A drupelet has been removed to show the larva gnawing the base of the fruit.
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  4. Byturus urbanus (Lindeman) (Coutin R. / OPIE)
    Adult bites into the raspberry bud

To read this page in French

HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.

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