Imazapyr

Trade name(s) Arsenal, Chopper, Arsenal Applicators Concentrate, Stalker, Habitat, Polaris

Manufacturer(s) Alligare, BASF, NuFarm America

Formulation(s) 0.5% Granule, Aqueous solutions of 2, and 4 lb/gal without a surfactant

Remarks Nonselective, imidazolinone herbicide applied preemergence or postemergence for long-term total vegetation control. Readily absorbed through foliage and roots. Registered for use only on noncropland.

Water solubility 15,000 ppm

Storage conditions Store above 10°F. Once mixed, solution can be stored in spray tank until ready to be applied.

Acute toxicity LD50 - 5,000 mg/kg

Action in plant Inhibits enzyme used in synthesis of some amino acids.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Imidazolinone