General Description

Tenacity Herbicide is a selective, systemic pre- and post-emergence herbicide designed for controlling broadleaf and grassy weeds in cool-season turf. Its active ingredient, Mesotrione, is derived from a naturally occurring compound in the bottlebrush plant (Callistemon citrinus), enabling long-lasting and effective weed management. It inhibits photosynthesis in susceptible weeds, absorbed through roots, shoots, and leaves, and translocated via xylem and phloem for complete systemic protection.

Technical Summary

Mode of Action

• Active Ingredient: Mesotrione (40% w/v)

• Mechanism: Inhibits the HPPD enzyme → blocks carotenoid biosynthesis → causes weed bleaching and death

• Absorption: Foliar and soil uptake, with systemic movement via xylem and phloem

• Herbicide Classification: HRAC Group 27 Herbicide

• EPA Registration Number: 100-1267

Target Weeds Controlled

• Controls over 46 broadleaf and grassy weed species, including:

• Crabgrass, goosegrass, dandelion, chickweed, clover, foxtail, etc.

• Safe for cool-season turf types:

• Kentucky Bluegrass

• Perennial Ryegrass

• Fine Fescue & Tall Fescue

Key Benefits

• Dual-action control: Effective for both pre-emergence (before germination) and post-emergence (early weed growth) use

• Targets difficult-to-control weeds

• Visible results within 10–14 days

• Turf-safe: Does not harm cool-season grasses

• Long-lasting weed suppression

Application & Coverage

• Formulation: Suspension Concentrate (SC)

• Application Method: Foliar spray (use with measuring cup and appropriate spray tip)

• Coverage: 43,000 – 87,000 sq. ft. per bottle (varies by dosage rate)

• Application Timing:

• Pre-emergence: Apply before weed germination

• Post-emergence: Apply during early weed growth stages

• Suitable Settings: Residential lawns, golf courses, sports turf, and general lawn care

Typical Applications

• Weed control in home lawns, golf course lawns, and sports turf

• Spot spraying for visible weed patches

• Preventive application for long-term weed suppression