Trade name(s) Beacon

Manufacturer(s) Syngenta

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