Some of my bermuda lawns are looking pretty bad.Just the tips of the blades are green and the rest of the plant is dark brown. The lawns are mowed every 5-7 days with less than a 1/3 being taken off. Used 32-5-7 fert on them,6weeks between apps. Wondering if it's too much rain and not enough sun here in atlanta area. Could it be a fungus? doesn't affect the top of the grass like most fungi i've dealt with. Any help is greatly appreciated.