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Study: Most Abundant River Pesticide Isn't the Most Risky

Nationwide study finds diamide insecticides in Chinese rivers; broflanilide poses highest ecological risk despite lower levels, and children face higher exposure.

This research matters because it challenges the common assumption that the pesticide found at the highest concentrations poses the greatest ecological threat. By showing that broflanilide, though less abundant than cyantraniliprole, drives screening-level risk for sensitive benthic midges, the study highlights the need for risk assessments that account for species-specific toxicity rather than relying on concentration alone. The findings also reveal that children face 2.4 times the modeled exposure of adults from ingesting untreated surface water, raising concerns about vulnerable populations. As diamide insecticides are increasingly used as safer alternatives to older pesticides, this nationwide snapshot provides essential data for regulators and researchers to monitor and mitigate potential ecological and human health impacts. It underscores the importance of targeted monitoring and species-specific thresholds in protecting aquatic ecosystems.