re: Keeping St Aug out of Centipede

Try sethoxydim sold under brand names (Fertilome Over the Top 11, Bonide Weed Beater, Hi Yield Grass Killer, etc). Needs to be mixed with oil concentrate. Will likely require multiple applications and expect some temporary yellowing of the centipede following application.

Used widely to kill Bermudagrass in centipede, but St Augustine is not tolerant as well although this is not stated on the product label.