Fungal disease
Downy mildew
How to recognise it
Yellowish patches on top, grey-violet fuzz underneath.
What helps
Thrives in wet conditions: keep foliage dry, water in the morning, space plants, remove affected parts.
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: Plasmopara viticola, Peronospora destructor, Pseudoperonospora cubensis, Peronospora sparsa, Bremia lactucae, Peronospora belbahrii