I recently wrote about bermudagrass white leaf, a mollicute disease seen in Asia on bermudagrass, at the Turf Diseases blog. See the bermudagrass white leaf post here. If you have this problem on your grass, it will probably go away in time as healthy plants grow over the dying chlorotic plants. For more information about ATC's investigations of bermudagrass white leaf, download the Field Day Book from 2008 at the Turf Information page of the ATC website.