Tenacity (Mesotrione)
Syngenta
Mesotrione is a selective, systemic herbicide widely used as both a pre- and post-emergent treatment for broadleaf weeds and grasses in corn and turfgrass. It is perhaps best known under the brand name Tenacity and is also available in generic formulations such as Meso 4SC. The herbicide works by inhibiting photosynthesis, causing affected weeds to turn white and die within 7 to 20 days.
Key Aspects of Mesotrione
Uses: Mesotrione controls over 46 weed species, including crabgrass, clover, dandelion, and yellow nutsedge. It is effective in turfgrass varieties such as Kentucky bluegrass and tall fescue, as well as in crops including corn, soy, and cranberries.
Mode of Action: Mesotrione functions as a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor, disrupting carotenoid biosynthesis. This disruption leads to chlorophyll destruction and characteristic bleaching of plant tissue.
Origin: Its development was inspired by the natural phytotoxic compounds produced by the Australian bottlebrush plant.
Environmental and Safety Considerations: Mesotrione poses a low risk to mammals; however, it is classified as H410, meaning it is very toxic to aquatic life with long-lasting effects. Due to its mobility in soil, caution should be exercised when applying it near water sources.
Application: For best results, mesotrione is typically combined with a surfactant to improve adherence and can be applied either to the soil or directly to foliage.
Rate: 0.18 fl oz per 1,000 sq ft
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