The War on Pests Isn’t Working. Here’s What Is.

Integrated Pest Management: A Sustainable Approach to Pest Management

There is something fascinating about the way we’ve waged war on pests. For decades we’ve treated them as the enemy, reaching for increasingly stronger chemicals in what has become a never ending cycle. Spray. Resistance develops. Spray something stronger. Kill the beneficial insects as well. More pests appear. Spray again.

Somewhere along the way, we forgot to ask a much simpler question:

Why are the pests there in the first place?

Throughout my experience both growing my own vegetables and working as a biological pest control consultant with commercial farmers across Zambia, there is one truth that is so simple that we somehow manage to overcomplicate it.

Healthy soil grows healthy plants.

I see it in my own vegetable garden.

I see it on commercial pivots stretching for hundreds of hectares.

The areas with hard, compacted, lifeless soils, soils that have been fed almost exclusively with synthetic fertilisers for years, where salts accumulate and there is very little soil biology left to cycle nutrients and build structure; are almost always the areas with the greatest pest pressure.

Meanwhile, the healthier parts of the field often tell a different story. Perhaps it’s less used land, perhaps they’ve received compost, mulch or cover crops, or perhaps they’ve simply had years of thoughtful management that has fed the soil as a living ecosystem rather than just feeding the crop.

The difference is remarkable.

I can’t talk about pest management without starting here, because this is where pest management really begins.

We’ve been taught that pests attack our crops, so the logical response is to spray preventative chemical pesticides before there’s even a problem. Relying on it as our first and only line of defence has come at a cost.

Many broad-spectrum insecticides don’t distinguish between the insects we want and the insects we don’t. They eliminate pests, but they also wipe out ladybirds, lacewings, hoverflies, parasitic wasps and countless other beneficial organisms that naturally keep pest populations under control.

The result?

We become increasingly dependent on spraying, while the pests themselves gradually develop resistance.

I visit farms across Zambia where certain insecticides that once worked brilliantly have lost much of their effectiveness. You can almost joke that the insects look at the spray, shrug their shoulders, say “kaya” and carry on eating.

So what do we do instead?

The answer is to become better observers.

One of the most common things people send me is a photograph with the question:

“What is this?”

And that is exactly where good pest management begins.

Identification.

Friend or foe?

Is the insect actually causing damage, or is it helping you?

Does the pest already have naturally occurring predators or parasitoids keeping it in check?

The more you understand what is happening in your garden or field, the better your decisions become.

“These aphids have already been parasitised by a tiny naturally occurring parasitic wasp. After one of the farmers I work with removed harsh, non-selective insecticides and switched to products that were compatible with beneficial insects, these wasps returned on their own and began controlling the aphid population naturally. Nature is remarkably good at solving problems we simply have to stop getting in her way “

Once you know what’s happening, you can make an informed decision.

Has the problem already been solved by nature?

Is the pest population increasing beyond acceptable levels?

Would a biological control agent or bio-pesticide be enough?

Or has the situation reached a point where a selective chemical pesticide is genuinely the most appropriate tool?

This is the heart of Integrated Pest Management (IPM).

Rather than relying on a single solution, IPM combines multiple approaches to produce healthier crops while reducing unnecessary pesticide use.

Think of it as working from the ground up.

It starts with prevention through good cultural practices: building healthy soil, selecting appropriate varieties, rotating crops, maintaining good irrigation, sanitising tools and removing diseased plant material.

Next comes regular monitoring and scouting. You can’t manage what you don’t measure. By checking your plants frequently, you can identify problems early and understand whether pest populations are increasing or whether beneficial insects are already keeping them under control.

Only then do you consider intervention.

Sometimes that’s as simple as pruning an infested shoot.

Sometimes it’s introducing beneficial insects such as predatory mites or parasitic wasps.

Sometimes it’s using a biological pesticide.

And yes, sometimes chemical control is still the right decision. But within an IPM programme it becomes the last option rather than the first, and when it is used, the goal is to choose products that are as selective as possible so that the rest of the ecosystem can continue doing its job.

At the end of the day, we all want beautiful tomatoes, healthy vegetables and productive farms, of course we do.

But perhaps the future of pest management isn’t about fighting nature harder.

Perhaps it’s about learning to work alongside it.

Because when we build healthy soils, encourage biodiversity and make informed decisions instead of reactive ones, we discover something remarkable:

Nature has been managing pests long before we arrived.

Our job isn’t to replace those systems.

It’s to restore them.