Acorn Weevil - Curculio glandium

Description

Length 4 to 8 mm. The most striking feature of the acorn weevil is its elongated snout, known as a 'rostrum', which is longer in females than males. Adults have a brownish and patterned body. Wevils in this genus can be hard to tell apart. C. glandium has 3 segments in the bulbous end of its antennae whereas C. nucum has 4 segments.

Similar Species

curculio.JPG

Curculio nucum and Curculio glandium are very similar but can be distinguished by the shape of the antennal club. C. glandium (on the left) has a narrower and more tapered club than C. nucum (on the right).

Identification difficulty
Habitat

Lives in Oak trees.

When to see it

Peaking in summer and autumn.

Life History

The female uses the long rostrum (snout) to bore into the centre of an acorn to lay her egg. The larva feeds within the acorn and eventually bores its way out. The larvae are short, and cylindrical in shape, and move by means of ridges on the underside of the body.

UK Status

Relatively common, particularly in the south of Britain.

VC55 Status

Fairly frequent in Leicestershire and Rutland. There were a total of 25 VC55 records for this species up to March 2015.

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Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map