Eriosoma lanuginosum is an aphid which causes the formation of a leaf gall on Elm which takes the form of a bladder looking like a pale green egg or pear which may be 6 or even 8 cm long and nearly as wide. The gall is more often seen than the adult aphid.
On elms, usually small leaved elms
Look for galls in June and July although they may persist over winter in a hardened form.
Aphids feed inside the gall protected from predators.
Uncommon in Britain.
Uncommon 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