Scientists from Royal Holloway University have found that when bees are exposed to low levels of neonicotinoid pesticides - which do not directly kill bees - their behaviour changes and they stop working properly for their colonies.
The results showed that exposure to pesticides at levels bees encounter in the field, has subtle impacts on individual bees, and can eventually make colonies fail.
This discovery provides an important breakthrough in identifying the reasons for the recent global decline of bees, a trend that has baffled many experts worldwide.