White fuzzy spots on my bird of paradise?
Sorry for the re-post but I wanted to include a link to a picture.
We have a beautiful indoor white bird of paradise that is now about 12 feet tall. About 8 months ago it started getting small (about 1/8 - 1/4")white spots on it's leaves. They can be removed with a damp rag but they will re-appear in a few weeks. If they are not removed quickly the leaf will turn yellow underneath the spots. I have tried two different kinds of fungicide, multiple times, but they keep coming back. They are heavier on the underside of the leaves but if they are not removed they will spread over the entire leaf. If the white stuff gets heavy enough, it takes on a fuzzy look. Other than these darn spots, the plant appears very healthy and continues to grow.
I have attached a photo of one of the leaves. I don't know what this is and I don't know what else to try. ANY suggestions would be greatly appreciated. THANKS!
Here is a link that might be useful: