Horse-chestnut leaf miner
Trees with a low number of attacked leaves are not greatly affected, but when the entire surface of leaves is covered with mines, the leaves start to dry [...] long and a rich brown colour with bright white chevrons edged with black. The larvae mine in horse chestnut leaves go to four (occasionally five instars) [...] where it spread to most of Europe. Since then, in all invaded regions, outbreaks have continued unabated, causing aesthetic damage to horse-chestnut, one