Which option is NOT listed as an example of pests that non-residual pesticides would be considered for?

• A. Rats
• B. Ants
• C. Spiders
• D. Bed Bugs

Answer: (B)

Non-residual pesticides are designed to act quickly and then fade away, so they’re often used for spot treatments where immediate knockdown is needed and long-lasting residue is undesirable or risky in areas like food handling or reentry zones. This approach works best for pests where you’re aiming for quick relief in the moment rather than long-term colony or population suppression.

Ants, however, live in and rely on their colonies. Treating them effectively usually requires products that persist or systemic actions that reach the nest, or baiting that disrupts the colony over time. A non-residual spray tends to kill individual ants it contacts but doesn’t provide the sustained effect needed to impact the entire colony, so it’s not typically considered the go-to option for ants.

Rats, bed bugs, and spiders are more amenable to short-acting, non-residual approaches in certain situations, such as quick spot knockdown or temporary relief, before longer-term strategies are applied.

So the pest that isn’t listed as a typical target for non-residual pesticides is ants.