Nicotinoid pesticides do cause bee decline

“… The UK government has always maintained that neonicotinoid pesticides do not threaten bees. It has laid the blame for high honeybee losses on the parasitic varroa mite which spreads viruses, and wet summers that prevent bees from foraging.

A European-wide two year ban on a number of pesticides linked to bee deaths came into force in December 2013. Last month, the UK government temporarily overturned the ban on two pesticides on about 5% of England’s oilseed rape crop …”.

http://www.theguardian.com/environment/2015/aug/20/pesticides-neonicotinoids-linked-bee-decline-first-time-large-scale-field-study