Ecological Engineering for Insect Pest Management in Rice Agroecosystems

Ecological engineering in rice systems encompasses deliberate habitat modification to bolster populations of natural enemies and thereby suppress insect pests without reliance on broad-spectrum insecticides. Core strategies include planting nectar-rich flowering species on field bunds, establishing banker plant refuges, conserving fallow patches and creating diverse vegetation strips adjacent to paddies. These interventions provide essential resources—such as shelter, nectar and alternative prey—for predators and parasitoids of major pests, including planthoppers and stem borers. By integrating landscape-scale diversity with on-field habitat enhancements, ecological engineering offers a scalable, cost-effective approach that maintains or enhances yield, reduces chemical inputs and conserves biodiversity. This paradigm underpins sustainable intensification of rice production globally, aligning crop protection with ecosystem resilience.

Research from Nature Portfolio

Recent studies have demonstrated that landscape composition and configuration exert strong influences on the abundance and efficacy of natural enemies in rice fields. In one investigation across multiple spatial scales, road edges and fallow patches were shown to support higher densities of ladybird beetles and spiders, significantly suppressing brown planthopper populations and reducing yield losses in Bangladesh. An estimated biocontrol service index revealed a positive relationship between landscape diversity and pest suppression, indicating that promoting fragmented habitat within rice landscapes can lessen prophylactic insecticide use.

Foundational eco-engineering research has highlighted the value of nectar-rich flowering plants on rice bunds as a means to enhance predator and parasitoid activity. Experiments comparing plots with and without bund-side plantings found that flowering strips increased both predator abundance and parasitism rates, while principal pests declined and grain yield remained unaffected. This work established that simple habitat manipulations can deliver robust biocontrol services in intensive rice production systems.

Another seminal contribution introduced a banker plant system in which a non-crop grass adjacent to rice fields supported a planthopper species that in turn sustained an egg-parasitic wasp targeting the brown planthopper. Laboratory and field trials demonstrated that this habitat-based augmentation increased parasitoid establishment without elevating planthopper damage, offering a compelling example of self-sustaining biological control achieved through ecological engineering.

Ecological Engineering for Insect Pest Management in Rice Agroecosystems publication trend

The graph below shows the total number of articles in ecological engineering for insect pest management in rice agroecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Ecological engineering: The deliberate design or modification of agroecosystem habitats to enhance natural enemy populations and ecosystem services.

Biocontrol agents: Predators, parasitoids and pathogens that naturally suppress pest populations.

Rice bund: Raised earthen barrier around paddies, often used for planting nectar-producing species to support beneficial insects.

Banker plant system: A strategy that uses non-crop plants to sustain alternative hosts or prey, thereby maintaining populations of natural enemies.

Economic Threshold Level: The pest density at which the cost of damage exceeds the cost of control measures, guiding timely intervention.

References

1. Effect of weather variables on seasonal abundance of rice insects in southeast coastal region of Bangladesh. Journal of Agriculture and Food Research (2023).
2. Seasonal variations of insect abundance: Correlating growth stage-specific metrics with weather patterns in Rangpur Region, Bangladesh. Heliyon (2024).
3. Landscape structure influences natural pest suppression in a rice agroecosystem. Scientific Reports (2023).
4. Selection of Nectar Plants for Use in Ecological Engineering to Promote Biological Control of Rice Pests by the Predatory Bug, Cyrtorhinus lividipennis, (Heteroptera: Miridae). PLOS ONE (2014).
5. Use of banker plant system for sustainable management of the most important insect pest in rice fields in China. Scientific Reports (2017).
6. Integrated Insect Pest Management Techniques for Rice. Sustainability (2023).