This method can be effective, even though undetected weeds will continue to spread across the area. Once the area has been infested with a large number of weeds, killing the entire area will be most effective. If a herbicide such as glyphosate is used, a number of applications will be necessary. Renovation can begin five to seven days following final glyphosate application. Turfgrass Renovation , for information on reestablishment.
Fumigation is probably the most effective way of eradicating perennial grassy weeds.
Fumigation of the infested areas will kill stolons and rhizomes, eliminating repeated herbicide applications and reducing the time the area is unsightly. The cost and very limited availability of fumigation precludes its use in most situations and is generally not recommended for homeowners. Control of perennial grassy weeds is a very difficult and time consuming process. One must weigh the advantages and disadvantages before deciding whether to attempt control or just tolerate the problem. Wadsworth, Director, West Lafayette.