I have a customer that has a lawn full of about 75% Zoysia and the rest is 25% perennial Rye and weeds (Zone 6). He wants all of the lawn to be 100% fescue blend. I planned on spraying the whole lawn with some round up quickpro then aerating and seeding followed by a starter fert app. I have no clue if this will fully kill all the Zoysia as I've heard horror stories of it coming back. Another idea I had was to use a sod cutter and take up as much as possible but I don't think I'll be able to get all the deep roots of the Zoysia. Any ideas on how to effectively get rid of this stuff?