I have a lot experience with St Augustine. It’s taken 3 years to perfect my yard. Brown spots are one of two things. One being the obvious…not enough irrigation water getting those spots. I’m assuming that’s not the problem. Most likely it’s the insect problem..cinch bugs or web crubs/worms. Either way they eat the roots of your grass. Hard rain would perk up the starving grass until it’s past the point of no return. Be PROACTIVE with insects. Put down every 4-6 weeks in the summer granular insecticide. Don’t wait until you see issues or it will take months to get your yard back. I irrigate mine 3x a week 40 minutes per grass zone during these hottest months.
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