The best Bermuda grass killer is an herbicide, such as glyphosate. To achieve optimum results, the herbicide is sprayed on the leaves of the grass. The leaves absorb more of the herbicide than the roots.
Due to its persistent nature and aggressive growth, Bermuda grass is difficult to eradicate. Continuous applications of an herbicide are needed to kill the grass effectively. Glyphosate is a type of broad-spectrum herbicide sold in commercial products, such as Roundup. This herbicide kills the roots of the Bermuda grass. After a treatment with a glyphosate-based herbicide, the Bermuda grass turns gray and brown within a week.