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Anthonomus rubi Herbst
Insecta, Coleoptera, Curculionidae .

Strawberry blossom weevil

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

- Adult: 2 to 4 mm long, dull black covered with a fine grey pubescence. Rostrum long and slightly curved. Antennae slender, inserted in the terminal third of the rostrum. Pronotum white, with a fine and very dense punctuation. Elytra short, with marked stripes (*) .
- Egg: white, smooth, shiny, slighlty oval, 0.50 x 0.35 mm.
- Larva: 3.0 to 3.5 mm long, curved, white; head brown.

- Host plant: raspberry, strawberry, bramble (Rubus), rose (Rosa) and wild rose (Rosa canina).
- Adult: directly after its emergence, it feeds a few days on the young leaves and the corollas (*) then enters diapause, sheltered under bark or in various other situations. It emerges in spring, feeds for a few days and mates. Oviposition occurs immediately after mating: with its rostrum, the female bores through the unopen flower bud; then turns round and introduces an egg in the centre of the floral tissue, on the young anthers or the stamens. It then incises the flower stalk, thus preventing sap circulation (*) .
- Egg: embryonic development lasts 5 to 6 days.
- Larva: growth lasts 18 to 22 days. Pupation occurs in the bud and adults emerge 8 days later, having perforated the bud.

[R]Life Cycle
- 1 annual generation.
- The young adults appear in the late spring and then; after a few days of activity, enter into a summer-winter diapause and reappear in the following spring.

Strawberry is the main host, and suffers from the very characteristic attacks of this insect: flower bud containing an egg does not develop but dries up, hangs on the peduncle and finally drops off.

[R]Common Names
DE: Erdbeer- u. Himbeerblütenstecher ES: Antonomo de la fresa y de la frambuesa FR: Anthonome du fraisier et du framboisier IT: Antonomo della fragola e dei lamponi PT: Antónomo do morangueiro GB: Strawberry blossom weevil

[R] Images

  1. Anthonomus rubi Herbst (Coutin R. / OPIE)
    Adult on a raspberry flower bud
  2. Anthonomus rubi Herbst (Coutin R. / OPIE)
    Damage on raspberry buds Before ovipositing, the female (arrowed) has cut through the flower peduncle.
  3. Anthonomus rubi Herbst (Coutin R. / OPIE)
    Damage on strawberry flowers Perforations and tears caused by feeding adults (arrowed). The attack occurred at the bud stage.

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