The wingspan is 5–6 mm. Adults are on wing from July to November.
The larvae feed on Malus baccata, Malus domestica, Malus floribunda and Malus sylvatica. They mine the leaves of their host plant. The mine consists of a small compact corridor, widening towards the end. The frass is concentrated in a broad, irregular central line.
- Fauna Europaea
- Media related to Stigmella incognitella at Wikimedia Commons
- Data related to Stigmella incognitella at Wikispecies
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