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.  The  sexual galls can also be found ion twigs and stems.

The agamic (asexual) galls are kidney/crescent-shaped, along the main vein of a leaf, and are pale green, later red/dark brown. 

Sexual galls Agamic galls Adult

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.

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.

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

Status in Leicestershire and Rutland not known.