The cheapest and easiest solution is to mow your grass and let the bermuda and St. Augustine decide who wins. Using "selective" poisons stresses your "good" grass, and never live up to the hype. Have watched for decades now as new Floridians try to have "pure" lawns of one type of grass and go through years of turmoil ending with... uglier weeds and no grass in the area they wanted the "other" grass out of.
Bermuda is resilient and DEEP rooted. Round Up mixed a little strong but don't mow the area for a couple weeks so the "greenery" can absorb enough to kill the root. 2 applications a month apart should do the trick. Then re-sod.
Pro Vista was used for the early properties South of 44. TV went back to Floratam after finding ProVista very problematic. If your St Augustine is deep green healthy and growing fast, likely you have Floratam.
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