common in parks and lanes where Aesculus hippocastanum
is planted, causing severe damage. Distributed in all provinces of
Belgium and first encountered in 1999 at Tervuren (BR).
larvae cause upperside mines in the leaves of Aesculus
hippocastanum. In many cases there are several mines in 1
leaf and from July onwards, some leaves are completely covered with
mines causing premature defoliation (see More pictures ). Females of the
third generation may have difficulties in finding oviposition sites,
and in such cases development can take place on Acer
pseudoplatanus. Pupation inside the leaf mines. The pupa
are three overlapping generations per year. The first imagines starting
to appear in April, resting on tree trunks. Swarms with thousands of
specimens were observed in early morning hours during sunny days in
Namur, Gembloux, 10 July 2008.
Imago with mine on Acer
(Photo © Jean-Yves Baugnée)