What is the white "stuff"?

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bobbie10 Rogersville, TN Dec 22, 2011

The circles on this plant are on several leaves and seem to be spreading. Can anyone tell me what it is and how to treat it?

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JoParrott Richland, WA(Zone 7b) Dec 27, 2011

Looks like mildew of some sort-

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HydroPinke Burien, WA(Zone 7b) Dec 28, 2011

What kind of plant is that? Gloxinia? If its 1/3 or less of the total foliage, I would start by removing the infected leaves. It does look like a mildew. I use a tea tree oil solution of approximately 10 drops in a pint of water. Spray it on once a week until gone.
There are many home remedies for mildew. http://www.google.com/search?q=home+remedies+for+powdery+mildew+on+plants&ie=UTF-8&oe=UTF-8&hl=en&client=safari

You could also go to a garden center and get a neem oil spray.

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