Mesotrione. Mesotrione (Tenacity) is a systemic postemergence herbicide for control of crabgrass, goosegrass, barnyardgrass

, and yellow foxtail. This herbicide can also control several species of broadleaf weeds, as well as creeping bentgrass, nimblewill, and nutsedge in turf.

What kills crabgrass permanently?

The best weapon in your quest to kill crabgrass is pre-emergence herbicide (also called crabgrass preventer). Apply it in the spring before the crabgrass seeds sprout. The granular herbicide works by creating a chemical barrier at the surface of the soil. As the seeds germinate, they take in the herbicide and die.

How long does it take for crabgrass tenacity to work?

After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll), and death may take up to three weeks. A repeat application is required after two to three weeks for improved postemergence weed control. 92 of 98 people found this answer helpful.