Wild pollinators including bees, butterflies, and hoverflies face significant welfare threats from pesticide exposure, with evidence of neurological and behavioural effects.
Pesticide welfare impacts on wild pollinators represent a growing area of ethical concern. Beyond population-level declines, sub-lethal pesticide exposures may cause individual welfare harms: impaired navigation causes bees to become lost and unable to return to colonies, dying of starvation or predation in unfamiliar environments. Neonicotinoids affect learning and memory - faculties that appear to be increasingly recognised as welfare-relevant in insects. Impaired foraging means colonies receive less food, increasing starvation risk for larvae. The cumulative effects of multiple low-level pesticide exposures are poorly understood but likely significant. The EU's precautionary principle has led to restrictions on neonicotinoid use, but emergency authorisations granted by the UK for sugar beet have continued exposure. As evidence for insect sentience and welfare capacity grows, the ethical weight given to these population-scale welfare impacts may need to increase significantly.