Weak evidence base for bee protective pesticide mitigation measures

Area of Science:

• Agricultural Science
• Environmental Science
• Ecotoxicology

Background:

• Pesticides are essential for food production but pose risks to non-target organisms like bees.
• Mitigation measures aim to reduce pesticide risks to bees without compromising crop protection efficacy.
• A critical challenge lies in balancing agricultural needs with environmental protection.

Purpose of the Study:

• To systematically review the scientific evidence supporting pesticide mitigation measures for bees.
• To assess the efficacy and empirical support for existing mitigation strategies.
• To identify research gaps concerning pesticide impacts on both managed and wild bees.

Main Methods:

• Conducted a systematic review of 34 publications evaluating pesticide mitigation measures on bees.
• Included studies assessing any mitigation measure at any scale (individual to population level).
• Focused on publications presenting evidence of measure efficacy.

Main Results:

• A limited number of studies provided direct evidence on mitigation measure efficacy.
• Many current mitigation measures lack thorough empirical testing and have weak evidence bases.
• Research predominantly focuses on managed bees, potentially neglecting wild bee populations.
• Label-recommended measures, frequently applied, are seldom empirically validated.

Conclusions:

• There is a need for more robust scientific evidence to support current pesticide mitigation recommendations for bees.
• Existing policies and practices may not adequately protect bee populations, especially wild bees.
• Future research should prioritize rigorous testing of mitigation measures and broaden focus to include wild bee species.