What is the term for the chemical in a pesticide that controls the target pest?

• A. Active ingredient
• B. Inert ingredient
• C. Carrier
• D. Adjuvant

Answer: (A)

The main idea here is identifying the component of a pesticide that actually provides pest control—the active ingredient. This chemical is the one that produces the pesticidal effect, whether by poisoning, repelling, or interrupting the pest’s biology. Inert ingredients are the rest of the formulation that don’t have pesticidal activity by themselves; they help with stability, handling, or texture. The carrier is the medium that delivers the active ingredient to the target—like the liquid in a spray or the base in a granular product. An adjuvant is an additive that enhances performance, such as improving coverage, adhesion to surfaces, or penetration.

Labels specify how much active ingredient is present because that rating drives the recommended application rate and proper use. Understanding this helps you pick the right product and apply it safely and effectively.