Answer: Wish there were a solution but any product you use to kill the bermuda will also kill your zoysia. Zoysia grass may be slow, but it is sure. It grows so thickly that over time it gradually out-competes Bermuda grass. I expect that within 5 years, your zoysia will outcompete the bermuda grass. Since bermuda grass roots can reach 4' deep, it's unlikely that you can effectively dig it out. I'd just allow the two grass types to co-mingle. Eventually the Zoysia will win out. Best wishes with your lawn!
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