The cynipid gall wasp Andricus testaceipes causes a gall to form on Oak. The single-chamber galls sometime coalesce. The agamic generation galls (known as Red Barnacle-galls) are usually found low on the main trunk of a smallish tree or sapling, or else on branches near the ground. The sexual generation galls affect the leaf stalk or midrib. This gall complex is not yet fully understood and subject to some debate.
Where a suitable host oak is available.
The galls persist for some time after the emergence of the wasps.
Status of Andricus testaceipes is difficult to determine as it is not well recorded in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015