What is the term for a pesticide that is a poisonous gas or becomes a gas when applied, used in soil or spaces in buildings?

• A. Fumigant
• B. Insecticide
• C. Rodenticide
• D. Repellent

Answer: (A)

A fumigant is a pesticide designed to be a poisonous gas or to release a toxic gas after application, allowing it to reach pests that hide in soil, voids, or spaces inside buildings. Because it works as a gas, it can permeate cracks, tunnels, and porous materials to kill pests throughout the treated area, even where liquids or solids can't reach. Fumigants are used in enclosed spaces or soil lots to treat infestations that are otherwise hard to access. Examples include gases that are released from compounds applied in the area, or gases that are applied directly as such.

In contrast, an insecticide covers chemicals that kill insects but aren’t necessarily gaseous. A rodenticide targets rodents, not insects or general pests. A repellent deters pests and doesn’t rely on gas to kill them.