Horse-chestnut leaf miner
1970s, from where it spread to most of Europe. Since then, in all invaded regions, outbreaks have continued unabated, causing aesthetic damage to horse-chestnut [...] leaf miner damage leaves by feeding between the upper and lower parenchyma. The mine starts to turn yellow and later brown. By this time, the damage is [...] generations. Adults of the first generation emerge from mid-June to late-July. Cameraria ohridella has two to four generations a year, depending on the temperature