The Forest Service will incorporate new data on inerts into updated fact sheets as it becomes available. The contents of three imazapyr formulations are listed below. Information on residue assay methods is not available. Imazapyr is used to control annual and perennial grass and broadleaved weeds, brush, vines, and many deciduous trees. In plants, imazapyr disrupts protein synthesis, and interferes with cell growth and DNA synthesis.
Sensitive plants die slowly.
Always read all of the information on the product label before using any pesticide. Read the label for application restrictions. After weeds emerge, imazapyr should be applied during active weed growth. For hardwoods, imazapyr can be applied between leaf emergence and leaf drop. Do not spray under windy or gusty conditions.