Biological pest control techniques

Biological Pest Control: What It Is, Types, and How to Apply It in Organic Farming

What is biological pest control?

Biological pest control is a plant health management strategy that uses living organisms — such as predators, parasitoids, or pathogens — to reduce agricultural pest populations. It is a fundamental tool in organic farming and also in integrated production, as it helps reduce or eliminate the use of chemical pesticides while maintaining the ecological balance of the agroecosystem.

This approach is based on principles of applied ecology: natural control, sustainability, biodiversity compatibility, and low environmental impact. When properly implemented, it is effective and safe for both crops and consumers.

Types of biological control: strategies and differences

Inoculative, inundative, and conservative

There are three main strategies in biological control, applied depending on crop type, production system, and pest pressure:

Inoculative: the release of small groups of natural enemies with the expectation that they will establish and reproduce in the crop. Common in greenhouses.
Inundative: mass release of organisms to achieve an immediate effect, especially under high pest pressure. Similar to a “shock treatment” but using live organisms.
Conservative: focuses on protecting and enhancing the natural enemies already present by providing refuge habitats, flowering strips, or reducing harmful treatments.

These strategies can be combined and adapted to different cultivation conditions, especially in organic systems where biodiversity plays a key role.

Main beneficial organisms used in agriculture

Ladybugs, lacewings, mites, parasitoids

Some of the most widely used organisms in biological control include:

Ladybugs (Coccinellidae): voracious predators of aphids, mealybugs, and insect eggs.
Lacewings (Chrysoperla spp.): larvae that feed on aphids, thrips, and other soft-bodied insects.
Predatory mites: such as Amblyseius swirskii or Phytoseiulus persimilis, effective against thrips, spider mites, and whiteflies.
Parasitoids: such as Aphidius colemani or Encarsia formosa, which lay eggs inside pest insects (aphids, whiteflies), killing them from within.
Entomopathogenic fungi: such as Beauveria bassiana or Metarhizium anisopliae, which infect and kill pests by contact.

How to apply biological control in the field

Release, conservation, and environmental conditions

For biological control to work effectively, it’s essential to apply organisms properly:

Planning: evaluate pest pressure, crop stage, and compatibility with other interventions.
Release: follow recommended dosages, distribute evenly, and choose the right time (avoid extreme heat).
Conservation: encourage auxiliary flora habitats, reduce aggressive treatments, and ensure appropriate humidity levels for beneficial organisms to thrive.

Recommendations for successful biological management

Recordkeeping, monitoring, and technical support

Monitor pests and beneficials regularly.
Avoid pesticides that harm natural enemies.
Use certified suppliers and release viable organisms.
Work with biocontrol specialists for technical guidance.

Biological pest control is an effective and sustainable alternative that is part of the future of agriculture: productive, resilient, and environmentally respectful.