Bermuda and Zoysia are genetically very similar. A regular herbicide that will kill the Bermuda will also kill the Zoysia. There is a chemical, fusillade, that can kill only the Bermuda. It is sold under the trade name Ornamec, and is carried by the John Deere place in Leesburg. I have my lawn cared for by Zoysia Green. The brew that they use has this chemical in it, and it does keep the Bermuda at bay.
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