• Tenacity herbicide is now approved by U.S. Environmental Protection Agency (EPA) for use on residential lawns.
• Tenacity can be used at seeding, including bare-ground renovation seeding, or selective overseeding. It keeps weeds from germinating and allows new grass to flourish.
• Lawn care operators now have a new tool for pre- and post-emergence weed control on cool-season turfgrasses such as tall fescue, perennial ryegrass and Kentucky bluegrass.
• The active ingredient mesotrione controls more than 40 broadleaf weeds and undesired grasses and sedge, including nimblewill, crabgrass, bentgrass and nutsedge.
• Tenacity is now packaged in 8 oz bottles.
The selective pre- and post-emergence herbicide controls 46 broadleaf weeds and undesired grasses in most cool-season turf types. In addition to weed control in established turf, Tenacity can be applied at seeding to reduce weed competition for improved seedling development.
Tenacity was granted Reduced Risk status by the EPA due to its active ingredient, mesotrione, which has favorable ecotoxicity and human health profiles, compared to many registered herbicides, reducing the herbicide load on the environment. Its mode of action is novel among turf herbicides, and it fits well into IPM and resistance-management strategies. As Tenacity is not yet registered for use in all states, lawn care operators should check with their state or local extension service prior to buying or using this product.
Mesotrione is based on a compound produced by the bottlebrush plant (Callistemon citrinus). Discovered and developed by Syngenta, mesotrione provides systemic pre- and post-emergence control of numerous weeds including nimblewill, chickweed, clover and yellow nutsedge. Additionally, it is the only herbicide available that offers control of crabgrass both pre- and post-emergence (up to the fourth tiller).
Tenacity has been tested and proven acceptable for use on many turf species including: Kentucky bluegrass, centipedegrass, tall fescue, perennial ryegrass and fine fescue.