Biological Control Strategies for Invasive Species

Biological control strategies provide sustainable approaches to mitigate invasive species by employing natural enemies such as predators, parasitoids or pathogens to suppress invader populations. These strategies include classical biological control, which introduces specialised natural enemies from an invader’s native range to establish self-sustaining control; augmentative approaches, involving periodic releases of mass-reared agents; conservation biological control, which enhances efficacy of native natural enemies by modifying habitats; and biotechnological supplements such as phenological targeting and precision deployment using drones. Recent advances emphasise rigorous host specificity testing and climatic matching to reduce non-target impacts, alongside integrated pest management frameworks that combine biological control with mechanical and chemical methods. The adoption of spatially explicit models and climatic niche analyses has improved agent selection and predicted establishment success, while restoration ecology integrates competitive planting of native species to limit reinvasion. Case studies include the introduction of Galerucella beetles against purple loosestrife and the accidental establishment of Ophraella communa for common ragweed control, demonstrating both direct population suppression and wider ecosystem service benefits. Emerging tools such as remote sensing and genetic biocontrol hold promise for refining agent deployment and monitoring, offering scalable solutions to diverse environments across wetland, agricultural and forested systems.

Research from Nature Portfolio

A comprehensive field-based study in montane landscapes has documented the phenological dynamics and competitive interactions between Lantana camara and neighbouring native species. This work identified specific native shrubs and grasses that outperform the invader at key growth stages, informing a restoration framework that combines mechanical removal with sequential planting of competitive natives to restore affected habitats. In temperate Europe, quantitative assessments of the impact of Ophraella communa on Ambrosia artemisiifolia reveal substantial reductions in pollen production and allergy incidence, with modelling indicating a decline of over two million allergy cases annually. These findings underscore the human health benefits of classical biological control and highlight the economic valuation of ecosystem service restoration achieved through targeted natural enemy introductions.

Biological Control Strategies for Invasive Species publication trend

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

Technical terms

Classical biological control: Introduction of co-evolved natural enemies to establish long-term regulation of an invasive species.

Augmentative release: Supplemental periodic or inundative release of mass-reared biological control agents to boost population suppression.

Host specificity: The degree to which a biological control agent restricts feeding or reproduction to target species, minimising non-target effects.

Propagule pressure: The number and frequency of individuals of an invasive species introduced into a new habitat, influencing establishment probability.

Phenological assessment: The study of timing of life-cycle events to align agent release with vulnerable stages of the target species.

References

1. Aerial Systems for Releasing Natural Enemy Insects of Purple Loosestrife Using Drones. Drones (2024).
2. Factors affecting establishment and population growth of the invasive weed Ambrosia artemisiifolia. Frontiers in Plant Science (2023).
3. Invasive Mechanisms of One of the World’s Worst Alien Plant Species Mimosa pigra and Its Management. Plants (2023).
4. Investigating the phenology and interactions of competitive plant species co-occurring with invasive Lantana camara in Indian Himalayan Region. Scientific Reports (2024).
5. Biological weed control to relieve millions from Ambrosia allergies in Europe. Nature Communications (2020).