http://www.europarl.europa.eu/committees/en/studiesdownload.html?languageDocument=EN&file=79433

KEY FINDINGS
 Although bee declines can be attributed to multifarious causes, the use of
neonicotinoids is increasingly held responsible for recent honeybee losses.
 Neonicotinoids show high acute toxicity to honeybees.
 Chronical exposure of honeybees to sub-lethal doses of neonicotinoids can also
result in serious effects, which include a wide range of behavioural disturbances in
bees, such as problems with flying and navigation, impaired memory and learning,
reduced foraging ability, as well as reduction in breeding success and disease
resistance.
 Recent scientific findings are urging to reassess the bee safety of approved uses of
neonicotinoid insecticides at European level. A current review, carried out by the
European Food Safety Authority EFSA (on behalf of the European Commission) will
give new insights into this issue.
 As long as there are uncertainties concerning the effects of neonicotinoids on honey
bees, the precautionary principle in accordance with the Regulation (EC) No
1107/2009 should be applied when using neonicotinoids.

The 1107/2009 EU regulation concerning the placing of plant protection products on the market is here:
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2009:309:0001:0050:EN:PDF