What does A.I. stand for in pesticide labeling?

• A. Active ingredient
• B. Actual Instructions
• C. Applied Insecticide
• D. Analytical Index

Answer: (A)

On pesticide labeling, A.I. stands for the Active Ingredient—the chemical component that actually provides the pesticidal effect. This is the part of the product that does the pest-killing work, whether it targets insects, weeds, or fungi. Labels list the active ingredient (often abbreviated as a.i.) and show its percentage by weight, helping users know how strong the product is and how to measure it correctly. Inert ingredients—carriers, solvents, surfactants, adjuvants—aren’t what do the pest control work, they just help deliver the active ingredient.

So, the term that matches A.I. is Active Ingredient. The other options don’t fit because they describe directions, general labeling terms, or unrelated indexing measures rather than the component responsible for pest control.