Pest
Box tree moth
How to recognise it
Green-and-black caterpillars and webbing inside box, stripped from the inside.
What helps
Pick off or hose out caterpillars, check inside regularly; ask a garden centre about biological controls.
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: Cydalima perspectalis