Epitrimerus trilobus is a mite that causes galls to form on the leaves of Elder. The gall is seen more often than the mite that causes it. Margin of leaflet rolled upwards and slightly thickened, roll 1 - 5mm wide, tight or loose, short or extending around most of the leaf; leaf may be creased or buckled and reduced in size; contains mites:
On the leaves of Elder.
Summer when Elder is in full leaf.
Thought to be widespread and fairly frequent in Britain, but badly under recorded.
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