Recording method

Rests on tree trunks.  Comes to light.  At first sight, mines can be confused with brown blotches made by the fungus Guignardia aesculi.

Life Cycle

Larvae present June-July, August-October.  Usually many mines per leaf, sometimes turning the leaf brown.  Adults fly April-June, July-September.

Larval foodplants

Horse-chestnut.  Less frequently found on Red Horse-chestnut Aesculus carnea, Norway Maple Acer platanoides or Sycamore.