Spectracide Weed Stop For Lawns Plus Crabgrass Killer2 (AccuShot Refill) For use with reusable AccuShot sprayer included with Spectracide Weed Stop for Lawns Plus Crabgrass Killer Kills yellow nutsedge and other tough lawn weeds Visible results in 8 hours Kills over 250 weed types as listed, including crabgrass