"small swelling under the bud scales of a current year’s shoot, mostly several together. In each gall a larva with the colour of red lead. Univoltine."

[photos]

- Willem N. Ellis: (2021) Plant Parasites of Europe^©

Reference: https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/diptera/nematocera/cecidomyiidae/cecidomyiinae/lasiopteridi/lasiopteridi-unplaced/piceacecis/piceacecis-abietiperda/