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Where did the rust on my lawn come from, will fungicide eliminate it and how can I prevent it?

My lawn has developed a faint orange tint. After some investigation, I discovered that my lawn has a disease called rust. I have since treated it with fungicide. However, I still see it in many patches in the yard. Where did the rust come from, will the fungicide eliminate it, and how can I prevent this from happening again?
Submitted by BHGPhotoContest

Rust is a common disease. It can pop up in any lawn (newly seeded lawns frequently experience worse rust than established lawns), but it doesn't necessarily mean you have a problem that needs solving. Because rust is not terribly harmful (it just looks bad), and because fungicides are expensive (and may require sequential applications to work well), relatively few homeowners choose this approach. If the right fungicide is used, it can cut down on the rust, but the best way to prevent rust is to keep the lawn healthy, well watered, and fertilized. In seasons when the grass grows rapidly, it will outgrow the rust, which can simply be mowed off.

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