Trigonaspis megaptera


The gall wasp Trigonaspis megaptera causes galls to form on Oak. The sexual generation galls, often hidden by litter, from on dormant buds at the foot of mature stems, but also of seedlings and suckers. They are up to 1 cm in size and have a waxy surface. The colour ranges from white through cream and pink to reddish brown. 

Identification difficulty

Adult Galls

Recording advice

Adult:  Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Gall: Good quality photographs required, please also state host species.

When to see it

The sexual generation galls appear in April maturing in May and June. The asexual generation occur only late in autumn (September-October), often when the leaves are colouring already.It seems to be widespread, but not well recorded in Britain.

UK Status

It seems to be widespread, but not well recorded in Britain.

VC55 Status

Status in Leicestershire and Rutland not known.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map