PlantPalWhite dust on leaves: powdery mildew?
Look for spreading powdery patches. Dried water marks and mealybugs can look white too.
What to check first
Check leaves and young shoots for irregular, floury patches. Water spots tend to follow dried droplets; mealybugs look like separate cottony clumps, often at leaf joints.
What to do now
Give the plant more space and air circulation. If only a few leaves are heavily covered, remove those and clear fallen leaves. Avoid stripping a plant of most of its foliage.
What to watch next
If the plant is otherwise growing well and patches stay limited, monitor it. If the coating spreads onto new leaves or buds, get advice specific to the plant before treating.