A study with data from 284 sites across 40 US States has revealed that common fungicides were the strongest factor in the decline of four bumblebee species.
Bees feed on fermented pollen – i.e. bees need yeasts to assist with digestion of pollen – so fungicide would be expected to harm bees. This research links the presence of the fungicide chlorothalonil with the presence of a bee gut pathogen – Nosema bombi.
Chlorothalonil is a widely used fungicide in UK – especially in cereal crops.