Here is a Japanese report of an apiary-based trial on the effects over time on bee colonies, of various levels of two neonicotinoids which are routinely sprayed on Japanese rice paddies.
To crudely summarise, all colonies fed neonics died with CCD symptoms; the controls did fine.

There are problems with the quality of the translation, and it's possible that some forum members may criticise some of the trial parameters and methodology.

Nevertheless, on the back of the Harvard study, this is a clear support for the case against neonicotinoids, is it not?

See:

http://www.bijensterfte.nl/sites/def...%282012%29.pdf