Applications: Biochemistry Affects sensitive weeds through inhibition of the enzyme acetolactate synthase (ALS). Inhibition of ALS leads to the rapid cessation of cell division and subsequent growth processes in plants.  Mode of action Selective systemic herbicide absorbed through the roots and foliage and translocated to the apex of the plants. Symptoms appear within days with death within 2-4 weeks.  Uses Controls a wide range of grass and broad-leaved weeds in wheat, barley, rice, oats and triticale by post-emergence application, at 4-8 g/ha. Toxicology: Birds Acute oral LD50 for mallard ducks >2510 mg/kg. Dietary LC50 (8 d) for mallard ducks and bobwhite quail >5620 mg/kg diet.  Fish LC50 (96 h) for rainbow trout and bluegill sunfish >150 mg/l.  Daphnia EC50 (48 h) >120 mg/l.  Algae EC50 (72 h) for green algae 0.157 mg/l.  Other aquatic spp. EC50 for Lemna gibba 0.36 mg/l.  Bees Non-toxic to bees; LD50 (oral) >44.3 mg/bee; (contact) >50 mg/bee.  Worms LC50 >1000 mg/kg.