Pest
Leaf miners
How to recognise it
Pale tunnels or blotches inside leaves.
What helps
Remove affected leaves; for horse chestnut, thoroughly dispose of fallen leaves in autumn.
Often a care issue is behind it (watering, light, placement) – the care check in the app helps narrow it down.
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Check a photo – freeTypical organisms: Cameraria ohridella, Liriomyza trifolii, Liriomyza huidobrensis, Phyllocnistis citrella, Phytomyza ilicis