Fungal disease
Box blight
How to recognise it
Brown patches, leaf drop, black streaks on stems.
What helps
Remove affected parts generously (household waste), clean tools, avoid cutting when wet; consider resistant alternatives.
Often a care issue is behind it (watering, light, placement) – the care check in the app helps narrow it down.
Not sure it's this?
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Check a photo – freeTypical organisms: Calonectria pseudonaviculata, Pseudonectria foliicola