What are these bare patches in my Bermuda lawn?
They get larger every year.

Bare spots in a Bermuda grass lawn can have several causes, including white grub damage, hunting billbugs, and fungal diseases such as spring dead spot. When bare patches expand from year to year without clearly defined edges, grub feeding on grass roots is one possibility worth investigating. A simple lawn test involves cutting a one-foot square of sod near the advancing edge of the damaged area, peeling it back, and checking the soil for white grubs. Billbug damage can also affect Bermuda and zoysia lawns and may resemble winter injury; look for small feeding holes near the base of the grass blades. Fungal problems can vary depending on the type of turfgrass and the season, with spring dead spot being a concern in Bermuda grass. Properly identifying the cause of expanding bare spots is the first step toward choosing the right lawn treatment and restoring healthy Bermuda grass.

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Related Resources:
Turfgrass Diseases and Their Control
Lawn Diseases
Turfgrass Diseases in Georgia: Identification and Control