re: What is killing my St Augustine?

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Root rot, too much rain and heat, fungus....?

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Yep - possibly all of the above? If you can post photos, from distance and close up, ronk is very good at identifying disease and insect issues from good photos.

Centipede is more tolerant, though not immune, than St Augustine to many of the lawn fungal/diseases issues. The constant/frequent rain not allowing lawns to dry is a tinder box for lawn disease issues.