Horse-chestnut leaf miner
The horse-chestnut leaf miner, Cameraria ohridella , probably originates from natural stands of the European horse-chestnut in Greece, Albania and Macedonia [...] observed attacking ornamental horse-chestnut trees in Macedonia in the 1970s, from where it spread to most of Europe. Since then, in all invaded regions, outbreaks [...] Eventually the mines may cover the entire surface of the leaflets, especially from July on, when the second and third generations develop. Trees with a low