I would like some advice on how to proceed with my lawn. Prior to this year my grass was almost all tall fescue but this past spring and summer it was invaded by centipede grass. The centipede grass has taken over more than half the lawn and nothing I have tried has stopped its spread. I was afraid that if I didnt do anything it would take over the rest of the lawn. A few weeks ago I killed most of the lawn with round-up. I killed the parts already overrun by centipede grass and a portion of the fescue bordering the centipede grass parts. The parts I sprayed with round-up are completely dead and I was wondering if I should extract the dead grass with a tiller prior to aerating and over-seeding with tall fescue grass seed. Or would extracting the dead grass be unnecessary? Should I just aerate and over-seed over the dead grass? I dont want to go through the trouble of tilling up the dead grass if I dont have to. But I also do not want the centipede grass to re-emerge. Do you have any suggestions or advice?