How do chemical pest barriers work?

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Spray it around your home and you’re bug free for a year, how?

In: Chemistry

Think of it as acid being thrown at you every time you try enter a restricted area. This but at a bug scale

They use a persistent insecticide poison.

Many chemical compounds are long-term stable, even outdoors. Unless the area is thoroughly washed they will persist and keep killing insects for a long time.

Depends on the pesticides, you’d have to read how that particular pesticide works. But in general, pesticides that claim they only need one application every few months have a long residual.

The chemical remains on the surface, and either acts as a repellent, or makes the chemical will stick to the bug as it walks over it and it will die.