Acalitus rudis
Description
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 
Habitat
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.
Peter SmithCropston garden22 August 2017Between veins
Peter SmithCropston garden30 June 2018Galls on silver birch
Peter SmithCropston garden30 June 2018Galls on silver birch
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015