Trade name(s) Beacon
Formulation(s) 75% water-dispersible granules packaged in water-soluble packets.
Remarks A selective postemergence herbicide used at low rates on field corn to control certain grasses and broadleaf weeds. Carefully consider crop rotation plans before using.
Water solubility 1 ppm at pH 5; 600 ppm at pH 8.
Storage conditions Stable
Acute toxicity LD50 - greater than 5,050 mg/kg
Action in plant Interferes with plant enzyme acetolactate synthase, resulting in rapid cessation of cell division.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
Koc Average is 50 mL/g (estimated) for Primisulfuron-methyl