Last modified: April 10, 2021, 2:19 p.m.
A rare species in Belgium, distribution insufficiently known due to the difficulty with Ocnerostoma piniariella.
Distribution is based only on individuals that have been checked for genitalia.
This species is believed to be much more common than O. piniariella.
To reliably separate Ocnerostoma friesei from Ocnerostoma piniariella, it is usually necessary to refer to dissection of the genitalia, although O. piniariella has whitish or grey antennae with white rings, compared to the present species which has wholly grey antennae.
Forewing male pale grey and white at female with slightly greyish colour along dorsum.
See also bladmineerders.be
The adults fly in two or three generations a year: from March to May, again in July and August and sometimes in October and November.