Appearance
The wingspan is 7–8 mm. Adults are on wing from May to June and again in August.Food
The larvae feed on ''Castanea sativa'', ''Quercus faginea'', ''Quercus petraea'', ''Quercus pubescens'', ''Quercus robur'', ''Quercus rubra'' and ''Quercus trojana''. They mine the leaves of their host plant.The mine has the form of a short, angular corridor with much black frass and a large larval chamber. The larvae leave the mine and engage in lower-surface window feeding. Larvae can be found in July and again from September to October. They are greenish grey mottled with white and with a light brown head.
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