Indoor roses get powdery mildew because home conditions (warm days, cool nights, high humidity, poor air flow) mimic the disease's favorite environment. The gray-white talcum powder on leaves is fungal mycelium and spores.
Mix 1 tbsp baking soda + 2.5 tbsp vegetable oil + 1 gal water + 0.5 tsp castile soap. Shake well. Spray all leaf surfaces and soil every 5–7 days. Hose off leaves first to remove spores.
Neem oil, horticultural oil, potassium bicarbonate sprays. Rotate products. Move plant outdoors in summer for better air/light—mini roses thrive outside.
If needed, check garden center for indoor-safe fungicides (triadimefon, triforine, sulfur). Alternate to prevent resistance.
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