Imazapyr is in the imidazolinone family, interrupting acetolactate synthase and inhibiting branched chain amino acid production (i.e., valine, leucine, and isoleucine), leading to a slow development of necrosis and death. Another classic symptom includes massive proliferation of growing points immediately adjacent to the apical region. Similar to glyphosate, it is a broad-spectrum, non-selective herbicide that is particularly effective on grasses, though not on legumes. Thereis a strong potential for drift injury resulting from foliar over-application. Unlike GLY, IMZ can exhibit residual soil activity resulting in root uptake by neighboring plants and the suppression of seed bank germination. Aquatic applications can only be made by federal or State government entities or by applicators who are licensed or certified and are making applica- tions under a program sponsored by federal or State government entities.