Acalitus rudis


Acalitus rudis is a gall mite that causes galls to form on the leaves of Birch (Betula species). The gall is an erineum between the veins of the leaf. It is usually on the underside of the leaf, with or without a bulge on the other side. The hairs are quite long, white or yellowish when young, later a deep red brown.

Identification difficulty

Adult Gall


Where the host Birch species are found.

When to see it

Whenever Birch is in leaf.

UK Status

This is the commonest erineum on Birch, but it remains difficult to determine the exact status in Britain due to lack of records.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


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

UK Map