Cameraria ohridella is a small moth. Adults are around 3.5mm in forewing length. They are orange-brown in colour and have:
a basal white longitudinal streak
4 whitish, bent or interrupted fasciae edged in black
greyish brown hindwings, long-fringed
antennae over 4/5 forewing length
legs with equal white and black bands
Larvae are also small – up to 5.5mm long.
The moth’s leaf mines are easily recognised as multiple, conspicuous whitish yellow and brown blotches on the surface of horse-chestnut leaves and cause significant browning towards the end of the summer.