Chlorsulfuron is a selective herbicide registered for the control of tall fescue in many turf species. Spot apply chlorsulfuron according to label instructions. The tall fescue will gradually thin and die, allowing the desired species to fill in. Reseeding should not be needed. Do not apply chlorsulfuron to perennial ryegrass.
Perennial ryegrass is very susceptible to chlorsulfuron damage.
Creeping bentgrass is a desirable species on golf courses greens, tees, and fairways but is considered a weed in higher-mowed turfs. It is often found in circular patches growing over the top of the desired species. Bentgrass can be identified by its fine texture and spreading growth habit. It has rolled vernation, membranous ligules, prominent veination on the upper surface of the leaves, and pointed leaf tips. Nimblewill is a weed that resembles creeping bentgrass.