Problem: Bentgrass (Lawns)
Agrostis species Several kinds of bentgrass exist, most commonly grown on golf course putting greens, where the grass is cut very short (from 1/4 to 1/2 inch tall). Bentgrass needs to be cut short to be attractive. The invasive nature of bentgrass makes it a weed in bluegrass and ryegrass lawns, which are cut 11/2 to 2 inches tall. At this height, bentgrass becomes matted and straggly. Bentgrass is very invasive and will crowd out other grasses. It is introduced into a lawn in several ways: through seeds in the soil, lawn equipment, or seed mixtures and sod, or from nearby unmowed areas.
Omit a regular mowing before treating to allow for enough leaf tissue to absorb the herbicide.