In St. Augustine, try an application of horticultural cornmeal. For Bermuda, I can not say anything, but (in my humble opinion): lucky you!
I realize many people appreciate bermuda, but to me, it is a weed. Everyone has their own opinions which is what is great about the world we live in. Diversity is the key. If everyone liked the same things... you can imagine how boring the world would be. And how very limiting this would be to our existence...and how this limitation could be detrimental to our survival. Viva la Difference! It makes the world go 'round!