Wyl in Atlanta has three dead dirt spots in Bermuda. Could be fertilizer burn (if recently over-applied) or brown patch fungus. Pull a handful: if roots are slimy/short, it's brown patch. If soil is crusty/salty, it's fertilizer burn.
Apply 10–15 lbs/1,000 sq ft over entire lawn (fungus spreads). Water in. Corn meal hosts Trichoderma that attack Rhizoctonia. Safe, effective.
Deep, repeated watering (6–8 inches, 2–3 cycles over days) leaches salts past root zone. Then start organic program.
Bermuda needs full sun. If spots are shaded, no grass will grow. Convert to shade ground cover or mulch.
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