Spectracide Acre Plus Weed Stop For Lawns Concentrate kills all major broadleaf weeds including dandelion, chickweed and clover (see product label for complete list). It kills weed roots and controls over 200 weed types as listed. When used as directed, this product kills the weeds, not the lawn. Use Spectracide Acre Plus Weed Stop For Lawns Concentrate to treat Northern and Southern grasses: Bluegrass, Fescue, Zoysia, Bermuda, St. Augustine (do not use on floratam variety of St. Augustinegrass in Florida), Bentgrass, Centipede, Bahia, Rye. Do not apply when daytime temperatures are above 85°F as lawn injury can occur. This product is rainproof in hours and delivers overnight results. Mix the formula with water at the rates listed on the label to treat up to 64,000 sq. ft.