I bought a Dracaena about 3 months ago. I water it 1-2 times a week and make sure the soil is moist, but not too damp. About 3 weeks ago, it started developing a white powdery substance on the leaves. Can you tell me what this is or what I can do to get rid of it?

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    a picture please! – kevinsky May 22 '12 at 16:09

In lieu of a picture, here is a blind guess: it is one of powdery mildew, a scale bug of some sort, or mineral deposits.

It is probably a scale bug.

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