The gall mite Aceria eriobia causes a felt like galling of the underside of the leaves of Field Maple. It appears white at first before turning red and finally brown. The dense hairs shelter numerous mites. The gall is seen more easily than the mite.
Anywhere that Field Maple grows.
The gall can be seen in Late summer until the leaves of the host plant fall.
Thought to be widespread and fairly frequent in Britain.
Thought to be fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015