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Length 6-9 mmWidespread and locally common wherever larval foodplant, hazel, occurs. Female bores through husk of embryo nut to lay egg. Larva feeds on developing nut inside case until it falls in autumn; pupates in ground. Adult seen April­June.
Habitat
Woods, parks and gardens with oak and hazel. Central and northern Europe.Diet
Adults April - July visiting hawthorn blossom for nectar. The female uses her long snout to drill into a young hazel nut, then lays an egg in the hole. The emerging larva feeds on the kernel until autumn, when the nut falls to the ground. The larva gnaws its way out of the nut and digs into the soil to pupate over winter.
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