I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
I suggest you begin by spraying the area with a product containing glyphosate following label instruction and taking care not to get it on desirable foliage. Then give that a week to work before close mowing and raking the dead material off of the surface and then rototiling about 2 inches deep to pepare to lay your new sod.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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