Two decades of EU pesticide substitution have not reduced impacts on stream invertebrates

Across 152 German agricultural streams (1998–2021), neither pesticide toxic pressure nor pesticide-related invertebrate impairment shows a detectable decline over 23 years.

• Why it matters: Regulation assumes that substituting hazardous pesticides with alternatives reduces harm, but long-term field evidence for stream invertebrates within the EU framework has been limited.
• What they did: Using a 23-year event-driven pesticide exposure record and stream-invertebrate community data, the study tested trends in toxic pressure and impairment over time.
• The result: Toxicity drivers shifted from organophosphates to neonicotinoids and then to pyrethroids, while the toxic pressure–community effects relationship stayed consistent, implying substitution changed chemicals rather than impact magnitude.

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