If I am not mistaken, you can't. Bermuda is invasive. The only way to kill it would be to re-sod the area where it is and keep the sod healthy or it'll rear its ugly head again. You can dig it up and hope your Zoysia will spread out and take over, but the bermuda will come back much faster and as you try to remove the bermuda you will also be removing any of the Zoysia that may have spread.
I used to grow the stuff on purpose for hay. We paid to have a field sprigged with Tift 44 bermuda. They put 3000 sprigs on a 12 acre field and by the end of summer it was covered with it. It grows and spreads faster than the grasses used for sod. It makes great hay for cattle and horses.
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If I'd known I was gonna live this long, I'd have taken better care of myself. Eubie Blake
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