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How can I destroy unwanted trailing grass without harming my bluegrass-sodded lawn?

Our beautiful bluegrass-sodded lawn is being taken over by a trailing grass, perhaps zoysiagrass. Is there any way to eliminate it without destroying the good turf?
Submitted by BHGPhotoContest

If you have a weedy, creeping grass in your bluegrass lawn, you have no good options. It really doesn't matter whether the weedy grass is zoysiagrass, Bermudagrass, creeping bentgrass, or some similar rogue grass. The only way to truly get rid of the zoysiagrass (or whatever it is) is to kill the entire infested patch with glyphosate (Roundup), then reseed or resod the affected area. Treat only the undesirable grass; glyphosate kills bluegrass too. But it leaves no residue in the soil, so you can replant quickly after the weedy grass dies.

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