Biological Control Strategies in Orchard Ecosystems

Biological control in orchard ecosystems harnesses natural enemies—predators, parasitoids and pathogens—to regulate key pest populations, reducing reliance on synthetic pesticides and promoting biodiversity. Strategies fall broadly into conservation, augmentative and classical approaches. Conservation biological control seeks to enhance the environment for indigenous natural enemies through habitat management, cover crops and selective pesticide use. Augmentative releases involve periodic introduction of mass-reared agents, such as earwigs and parasitic wasps, to bolster local populations during critical pest outbreaks. Classical biocontrol entails intentional introduction of exotic natural enemies to establish long-term regulation of invasive pests. Recent advances emphasise multi-trophic interactions and phenological synchrony, addressing how climate change may disrupt temporal alignment between pests and their enemies. Integrated pest management (IPM) frameworks now incorporate landscape-scale considerations and non-chemical exclusion methods—such as netting—to balance crop protection with ecosystem health. Practical applications span apple, pear and stone-fruit orchards globally, demonstrating that a diversified suite of natural enemies, underpinned by sound ecological understanding, can deliver sustainable pest suppression and safeguard orchard productivity.

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Biological Control Strategies in Orchard Ecosystems publication trend

The graph below shows the total number of articles in biological control strategies in orchard ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Biological control: The use of living organisms to suppress pest populations to levels that avoid economic harm.

Conservation biological control: Management practices that protect and enhance existing natural enemy populations through habitat modification and reduced pesticide impact.

Augmentative release: Periodic introduction of additional natural enemies, reared in captivity, to bolster control of pest outbreaks.

Intraguild predation: Predation among natural enemies that share the same prey, which can alter the effectiveness of combined biocontrol agents.

Trophic interactions: Ecological relationships between organisms at different feeding levels, including predators, prey and parasitoids, which determine the flow of energy and regulation of populations.

References

1. A whole ecosystem approach to pear psyllid (Cacopsylla pyri) management in a changing climate. Journal of Pest Science (2024).
2. Turning a Pest into a Natural Enemy: Removing Earwigs from Stone Fruit and Releasing Them in Pome Fruit Enhances Pest Control. Insects (2023).
3. Earwig Releases Provide Accumulative Biological Control of the Woolly Apple Aphid over the Years. Insects (2023).
4. Intraguild Predation or Spatial Separation? The efficacy and Interactions of Two Natural Enemy Species for the Biological Control of Pear Psyllid (Cacopsylla pyri). Journal of Insect Behavior (2024).
5. Non-target impacts of hail netting and insecticides on natural enemy abundance and diversity in a Midwestern U.S. commercial apple orchard. Crop Protection (2024).