Fungal disease
Late blight
How to recognise it
Brown-black patches on tomato or potato leaves and fruit, spreads fast in rain.
What helps
Remove affected parts at once, keep tomatoes under cover, water at the base, thin lower leaves.
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: Phytophthora infestans