Bentgrass is a cool season perennial spreading grass that is commonly used for golf course greens, tees, and fairways. For the lawn owner, bentgrass is often considered a weed.
Bentgrass is not a viable option for a home lawn because it is very expensive and difficult to cultivate and care for. It is characterized as a very fine-textured, bright green grass with flat, narrow leaves.
Unfortunately, there is no herbicide you can use to get rid of bentgrass that won’t damage the lawn you are meaning to grow. Patches of bentgrass will appear as fluffy, fine-textured clumps that you can remove with a spade or by just pulling. When removing bentgrass, do so about 1” into the ground and re-seed.
You can try a herbicide with glyphosate to remove bentgrass, but be aware that it will kill the wanted grass along with the unwanted grass. apply the herbicide to an area about six inches or so outside the patch of Bentgrass to kill the individual stems which are creeping outwards from the patch, otherwise, these patches will reemerge.
Apply glyphosate in spring or fall when the grasses are actively growing. Wait approximately seven days, then reseed or sod the area. If you decide to till the soil prior to establishment, and see bits of Quackgrass rhizomes coming to the surface, remove these. Or wait two weeks or so until enough new Quackgrass leaves emerge and kill the new plants with a second application of glyphosate.