Wingspan 7 to 9 mm. This is yet another very small, brown and white Phyllonorycter. The details of the patterning require very careful examination to determine the species and expert confirmation should be sought. The larva mines the leaves of Hazel, causes a rounded mine on the upper surface of leaves; the mine has a white papery surface.  Mature mines may cause the leaf to contract.

Similar mines are formed on Hornbeam by P esperella

Adult Leafmine

Photograph mine and note host species

Anywhere that Hazel is present.

Being bivoltine, the adults are on the wing in May and again in August.

The larva forms a blotch on leaves of Hazel

A common moth throughout much of the British Isles. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as common.

Commonly recorded as a leafmine in Leicestershire and Rutland.

http://www.leafmines.co.uk/html/Lepidoptera/P.coryli.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/lepidoptera/ditrysia/gracillarioidea/gracillariidae/lithocolletinae/phyllonorycter/phyllonorycter-coryli/