Anthonomus rubi

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Anthonomus rubi (click on image to enlarge it)
Source: Wikimedia Commons
on left side strawberry flower bud damaged by Anthonomus rubi (click on image to enlarge it)
Author: Robert Henschel
Source: Wikimedia Commons

Anthonomus rubi (Herbst, 1795) - (strawberry blossom weevil)

This small weevil is common in Europe and neighbouring regions, but has been also reported from North America (Franklin et al., 2021). It is a serious pest of strawberries in Europe, causing up to 60% yield losses. After laying an egg inside an unopened flower bud, the female feeds on the stalk of the bud, usually causing it to wilt.

The larva develops and later pupates inside the severed bud. There is one generation per year. In case the bud is not damaged enough to wilt, the emerging flower and fruit will be damaged by the larva. The adult beetles also feed on the young leaves, on pollen, and on the developing fruits. Other plants from the family Rosaceae like raspberries, blackberries or rose can be also host plants. The adult weevil is 1-2 mm long and black. It overwinters in weeds or moss.

Vernacular names
• Deutsch: Beerenstecher
Himbeerblütenstecher
Erdbeerblütenstecher
• English: strawberry blossom weevil
• Español: antónomo de la frambuesa
antónomo de la fresa
• Français: anthonome du fraisier
anthonome du framboisier

For a review see Tonina et al. (2021).