Trade name(s) Harmony, Harmony GT, Treaty, Volta
Manufacturer(s) Corteva, FMC, NuFarm, Rotam
Formulation(s) 75% dry flowable
Remarks A selective, postemergence herbicide with short soil persistence used at low rates to control certain broadleaf weeds in wheat and barley. Harmony Extra is thifensulfuron + tribenuron.
Water solubility 24 ppm at pH 4; 2,400 ppm at pH 6
Storage conditions Stable.
Acute toxicity LD50 - greater than 5,000 mg/kg
Action in plant Interferes with acetolactate synthase, resulting in a rapid cessation of cell division and plant growth in both shoots and roots.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
Koc Average is 45 mL/g at pH 7