Weed Control Methods Handbook, The Nature Conservancy, Tu et al. IMAZAPIC Synopsis

Imazapic is a selective herbicide for both the pre-and post-emergent control of some annual and perennial grasses and some broadleaf weeds. Imazapic kills plants by inhibiting the production of branched chain amino acids, which are necessary for protein synthesis and cell growth. It has been useful for weed control in natural areas, particularly in conjunction with the establishment of native warm-season prairie-grasses and certain legumes. Imazapic is relatively non-toxic to terrestrial and aquatic mammals, birds, and amphibians. Imazapic has an average half-life of 120 days in soil, is rapidly degraded by sunlight in aqueous solution, but is not registered for use in aquatic systems