Bentgrass can crowd out desirable lawn grasses and change the whole look of your lawn. Unless you practice golf in your yard, Bentgrass isn't something you want around. Kept very short, it looks neat and uniform. Allowed to grow, it forms dense, scraggly mats.
Spray-On Weed Control
You can spot treat actively growing Bentgrass with a product such as Round Up® Weed & Grass Killer. For more information, read How and where do I apply Roundup® brand products? Always read and follow label instructions before you start spraying.
Control It in the Summer Treat Bentgrass patches with a grass control during the summer, when the weed is actively growing. Be careful spraying, since most treatments for Bentgrass will also kill the grass you want. One week after spraying, mow the area short and reseed.