https://www.sciencedaily.com/releases/2018/07/180724105930.htm

While the introduction of new EU restrictions on the use of neonicotinoid chemicals five years ago has reduced exposure of bees living in farmland, the study found that overall more than half of all pollen and nectar samples collected from bee nests in Sussex, Hertfordshire and Scotland between 2013 and 2015 were contaminated.

The study is the first of its kind to highlight the risk to bees in urban areas posed by garden use of pesticides.