White Powder on Camellia Leaves: Scale or Powdery Mildew?

Scale insects: White, cottony bumps on leaves/stems.
Powdery mildew: Fungal dust on both leaf surfaces.

Two Possibilities

Atomic Grow foliar spray: claimed to wash off both insects and fungus while stimulating growth.
Follow with slow-release fertilizer after cleaning.

Proper ID helps, but the non-toxic spray addresses both.

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