How Can Horizon Scanning Revolutionize Pesticide Management in the Great Barrier Reef?

The waters of the Great Barrier Reef are threatened by pesticides flowing from surrounding farms. To tackle this, experts have started using "horizon scanning," a technique that looks ahead to spot challenges and opportunities before they become critical. This approach has been added to the traditional scientific consensus processes, which previously relied on past literature reviews. The scan highlighted emerging topics: a more dynamic pesticide regulation, the need to consider the whole farming system, inconsistent integrated pest management plans across sectors, new technologies like sensors and drones, and the growing complexity of involving farmers, Indigenous communities, and consumers. Some of these issues were barely mentioned in earlier consensus reports. Embedding these insights into future policies could make better use of the government and industry funds already earmarked for more sustainable farming practices. In practice, it means shifting from a retrospective view to a proactive one, anticipating problems and leveraging innovations before they become regulatory requirements. The outcome? Cleaner water, healthier corals, and a greener future for everyone.

Horizon scanning is a systematic methodology that combines literature analysis, stakeholder workshops, and predictive modeling to identify emerging trends. In pesticide management, it enables assessment of new chemicals, such as plant growth inhibitors, and emerging technologies like controlled-release systems based on nanomaterials. A critical aspect is evaluating pesticide mobility in soil, which depends on physicochemical parameters (solubility, Koc partition coefficient) and agricultural practices (crop type, rotation, vegetative cover). Integrated hydrological models, such as SWAT (Soil and Water Assessment Tool), have been adapted to simulate pesticide transport to waterways and ultimately to the reef lagoon. Moreover, climatic variability, especially intense rainfall events linked to climate change, amplifies the risk of pesticide concentration spikes. From a regulatory perspective, revising safety thresholds (ADI, ARfD) must consider synergistic effects among multiple chemicals, a still underexplored topic. Finally, participatory governance requires digital platforms for real‑time data sharing, fostering evidence‑based decisions and reducing conflicts between farmers and conservationists. Integrating these elements into the next generation of policies can shift pesticide management from reactive to preventive, optimizing resource use and protecting marine ecosystems.