"Exposure to the neonicotinoid clothianidin "significantly affects the learning of honeybees but has no effect on bumblebees", scientists from the University of Sussex have discovered. The research is the first time scientists have looked into how both species respond to field-realistic-levels of clothianidin, which was banned for use on flowering crops by the European Union in 2013. ..."
Read more here: Horticulture Week
and here: Proceedings of the Royal Society