Lyonetia prunifoliella

[1] It is found in most of Europe, except Ireland, the Iberian Peninsula, and the Mediterranean islands.

It is also known from Turkey, Kazakhstan, south-eastern Siberia, the Far East, Japan and North America.

Around the oviposition site a cavity develops, that in the end often leaves a hole in the leaf.

Then, the mine becomes a narrow, hardly widening, winding corridor, largely filled with a broad reddish-brown frass line.

The corridor then widens into a wide, full depth blotch, often against the leaf margin.