Fungal disease
Black rot (grape)
How to recognise it
Brown leaf spots with dark margins, berries shrivel into black mummies.
What helps
Remove mummies and fallen leaves, prune for airflow.
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: Guignardia bidwellii