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

Parameter	Details
Product Name	Tenacity Herbicide
Active Ingredient	Mesotrione (40% w/v)
HRAC Group	Group 27 Herbicide (HPPD Inhibitor)
Target Weeds	46+ broadleaf and grassy weed species (e.g., crabgrass, dandelion)
Suitable Turf Types	Kentucky Bluegrass, Perennial Ryegrass, Fine Fescue, Tall Fescue
Application Type	Pre- and post-emergence foliar spray
Coverage	43,000 – 87,000 sq. ft. per bottle
Visible Results	10–14 days
EPA Registration Number	100-1267

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