What Are the 3 Methods of Pest Control?
By Henry, Taff Pest Control · Reviewed October 2026
The three methods of pest control are physical, chemical and biological. That’s the textbook answer, and if you’re here for homework, you’re welcome to it.
But the textbook answer hides the interesting part: no working pest controller uses one method. The real skill is knowing how to combine them, in what order, and (just as often) which one to leave in the van. So here are the three methods properly explained, and where each one fits on a job in Cardiff.
1. Physical pest control
Physical control means dealing with pests through barriers, exclusion and traps rather than substances. It’s the oldest method and, done well, the most permanent.
In a typical week that looks like: mesh over air bricks and gaps where rats are getting in, anti-gnaw wire wool packed into holes, traps set and checked on a schedule, pigeon proofing on ledges and under solar panels, and mole trapping, which is physical control in its purest traditional form.
Its great advantage: a sealed hole stays sealed. Treatment deals with the pests you have; exclusion deals with the next lot too. Its real limitation: it depends on the building cooperating. A mouse fits through a gap the width of a biro, so “every way in closed” is a promise physical control can’t always keep. Anyone who tells you otherwise is selling something.
2. Chemical pest control
Chemical control covers rodenticides and insecticides: professional products, applied precisely, under regulations that exist for good reason.
In practice: gel bait that cockroaches carry back to the nest, targeted insecticide worked into the cracks and seams where bed bugs shelter, treatments for fleas and moths applied where they live rather than misted about a room. Where rodenticide is genuinely needed, it goes down carefully, in sealed, tamper-resistant stations in living spaces, and we’ll tell you exactly what we’re using and any precautions for children and pets.
We’re certified for professional rodenticide use, and trained to reach for it only when proofing and exclusion aren’t enough. That’s not reluctance for its own sake: with rats, poison in the wrong place means a carcass in a wall cavity, and we’d rather trap and know. Chemical control is a precision tool, not a default setting.
3. Biological pest control
Biological control means using a pest’s natural enemies against it. It’s mostly used in farming and horticulture, but it does turn up indoors: tiny parasitic wasps are one option for clothes and carpet moths.
It isn’t routine, but it’s an option we’ll consider. If it’s the right fit for your problem, we’ll recommend it; if a targeted treatment will do the job better, we’ll say so. Our usual approach to moths is on the moth treatment page.
How the three combine: IPM, or how we actually work
The professional standard is Integrated Pest Management, or IPM. It means looking at proofing, exclusion and the cause of the problem first, and reaching for chemical treatment when it’s genuinely needed, not as a default. The chemicals are the last tool out of the van, not the first.
On a real job that means questions before products. What is the pest? How is it getting in? What’s feeding it? A mouse problem that traces back to a gap under the kitchen units gets treatment and the gap closed; treat without closing and you’re renting a result, not buying one. A wasp nest in the wrong place gets treated; one that can be left is sometimes better left, because an intact empty nest deters next year’s queen. The method serves the outcome, never the other way round.
| Method | What it means | Where it fits in our work |
|---|---|---|
| Physical | Barriers, proofing, traps | First choice: the permanent half of most jobs |
| Chemical | Professional rodenticides and insecticides | When genuinely needed: precisely, with full explanation |
| Biological | Natural enemies of the pest | Case by case: mostly a farming method, sometimes an option for moths |
There’s more on how we work (and why we’ve never signwritten the van) on the about page.
Common questions
Which pest control method is most effective?
The combination. Physical control gives the lasting result, chemical control deals with an active infestation, and the judgement about balance is most of what you’re paying a professional for. Any answer naming a single method is answering a different question.
Is chemical pest control safe around children and pets?
Applied professionally, yes. That’s largely what the training and regulations are for. Placement is precise, rodenticide in living spaces goes in sealed tamper-resistant stations, and you’ll know exactly what’s been used and any precautions before we leave.
What is IPM in pest control?
Integrated Pest Management: the professional standard. Proofing, exclusion and root cause first; chemical treatment when genuinely needed rather than by default; and monitoring whether it has actually worked.
Can I do physical pest control myself?
Some of it, sensibly: keeping food sealed, fitting brush strips, meshing an air brick. The caution: sealing holes at the wrong stage of an active rat problem can trap animals inside the building. Deal with what’s inside first, then close the routes.
Worth reading: proofing goes much further against rats than against mice, for reasons our guide to rats versus mice sets out.
Got a problem and not sure which method it needs? That’s the free phone call. Tell us what’s happening and we’ll tell you straight what we’d do, and what it would cost.