Answer: I think the different grasses are trying to compete with each other and total eradication may not be possible. Fescue lawns grow best in cooler temperatures; Bermuda loves hot weather. So, as the fescue is going dormant or at least is not actively growing in heat of summer, the Bermuda is just coming into its own. Digging out the Bermuda and reseeding with fescue is one approach, using a Bermuda grass herbicide is another. Reseeding will be necessary once you've gotten rid of the Bermuda. Best wishes with your project!
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