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BiologyAdults feed on oak (1). The females lay their eggs in acorns; the long rostrum is used to bore through the thick wall of the nut (3) with jaws located at the tip of the rostrum. When it has almost reached the centre of the nut, the egg is inserted in the hole, which subsequently heals up (4). The larvae develop inside the acorns, burrowing out when they are fully-grown in order to pupate in the soil, leaving a small hole in the wall of the acorn (2).