Imazapyr non-target organisms are non-toxic to which groups?

• A. Highly toxic to mammals
• B. Non-toxic to fish, invertebrates, birds, and mammals
• C. Highly toxic to birds
• D. Highly toxic to fish

Answer: (B)

Imazapyr works by blocking a plant enzyme that mammals and other animals don’t rely on in the same way, so at labeled use rates it has low acute toxicity to non‑target wildlife. This is why non-target groups like fish, invertebrates, birds, and mammals are considered non-toxic to this herbicide under proper application. The other statements suggest high toxicity to these groups, which isn’t supported by standard labeling and toxicology data. Remember, risk to non-target organisms arises mainly from misuse—excessive concentrations, spills, drift, or runoff—so always follow label directions, use appropriate buffer zones, and avoid applying near water.