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He doesn't have a zoysia lawn but the effect on other grasses is the same. There are certain species of fairy ring mushrooms that kill the grass at the outer edge of the growing mycelium and others that cause a flush of bright green grass growth at the outer edge. Most of the fairy rings I have seen are the latter. You may or may not always see the actual fruiting bodies (mushrooms) associated with the fairy ring - they pop up when conditions are favorable. Here is a blog post I wrote about fairy rings: http://viettes.wordpress.com/2011/09/16 ... %e2%80%a6/.
The fungi are feeding on organic matter in the soil. There isn't a whole lot you can do to prevent this short of replacing the soil! The best thing to do is to dethatch the dead area, amend the soil with an organic fertilizer, and wait for the existing grass to fill in the dead area or reseed with something like Scotts E-Z Seed. Another link about mushrooms in the lawn: http://www.inthegardenradio.com/v.php?pg=116.