If there are no black spots on any blades, then it’s a nutrient issue. Black spots mean fungus from too much water.
Get Scott’s fertilizer for Southern Lawns (granular slow release use Scott’s broadcast spreader). Also, this time of year sod web worms and chinge bugs can yellow in patches then the grass dies, so be proactive and put down granular insecticide like Scott’s GrubX. If you want to be proactive on fungicide, I use Scott’s DiseaseX. Remember we don’t have good soil here, it’s nutrient lacking sand. You need to feed on a schedule following the fertilizer instructions (Scott’s every 3 months).
Watering a new lawn to get it established in this heat is rough. First month requires a lot of water. Watch the blades of grass for wilting. You’ll see it as a shadow on the lawn initially as the blades fold. Don’t cut under 3.5” or you’ll put the grass under stress. I’m watering 2x a week at 40 minutes. If I see wilting of blades I add a 3rd day for 20 minutes and it takes care of the wilting.
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