Imazapyr (Arsenal) is described as which type of herbicide?

• A. Non-selective; remains in soil; do not contaminate anything with it
• B. Selective grass control
• C. Broadleaf selective
• D. Post-emergent insecticide

Answer: (A)

Imazapyr is a non-selective herbicide that will kill a wide range of plant species, not limited to grasses or to broadleaf plants. It works systemically by inhibiting an essential enzyme in many plants, so it isn’t selective for just one plant type. It’s also soil-active and long-lasting: after application, residues can remain in the soil for a prolonged period, continuing to affect vegetation that emerges or comes into contact with contaminated soil. This combination of broad, non-target activity and soil persistence is what defines its behavior in forestry applications.

The other descriptions don’t fit: it is not a grass-only control, nor a broadleaf-selective product, and it is not an insecticide.