A brown or thinning patch in a Southwest Florida lawn can come from several very different causes, and the fix depends on getting the cause right.
Usually a landscape problem
Areas that stay wet or dry because of grading or irrigation coverage; shade where Floratam can't grow; compacted fill on new-construction lots; sod that never rooted into the soil underneath. These are fixed with drainage, irrigation adjustments, regrading, or new sod (or a better-suited grass).
Possibly a pest or disease problem
Irregular dead patches in sunny, hot areas, especially next to driveways and sidewalks, that spread in dry weather can point to chinch bugs in St. Augustine. Grass that pulls up easily with no roots can mean grubs. Circular patches in humid weather can be fungal. These need a diagnosis and treatment from a licensed pest-control company.
Who to call
Hodges installs and rebuilds lawns, irrigation and drainage. We don't provide pest or disease treatment. For insect or disease diagnosis and treatment, our partner Sun Pest Control is a licensed pest-control company serving Southwest Florida.