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Similar Ectoedemia, Ectoedemia intimella, Stigmella lemniscella, Ectoedemia argyropeza, Stigmella microtheriella | ||
Ectoedemia occultella, the small birch leafminer, is a moth of the Nepticulidae family. It has a Holarctic distribution. It is found in most of Europe, east through Russia (where it has been recorded from Murmansk, Karelia, Leningrad, Samara and Tatarstan and Sakhalin) to Japan. It is also present in North America. Mines very similar to that of Ectoedemia occultella have been found on Rosaceae species in Nepal and Japan and these may belong to this species.
The wingspan is 5–7 mm. Adults are on wing from May to July.
The larvae feed on Betula ermani, Betula grossa, Betula humilis, Betula nana, Betula obscura, Betula pendula and Betula pubescens. It has also been recorded from Salix pentandra in Finland. They mine the leaves of their host plant. The mine consists of a round, primary, upper-surface blotch without a visible initial corridor. There are often several mines in one leaf. The mine has a dark centre, where the larva often retreats.