Last modified: April 20, 2020, 11:06 a.m.
Observed for the first time in Belgium in 2018 in LG.
Ground colour brown, a long, more or less triangular, yellowish spot along the costa, reaching till just before the apex. Some very small brownish spots along the costa.
Starting as a rather short, narrow, epidermal serpentine gallery on the underside of the leaf, the mine broadens into a small triangular blotch, most of the time in a vein axil.
See also gracillariidae.net.
Pupation in a yellowish transparent cocoon.
Later instars leave the mine and feed freely from a cone or a downwards folded leaf edge.