There's a thread over on gotmead where this subject did come up. For reasons I outlined there, I don't know if such a ban would be beneficial or not, so before calling for a ban, I'd like to get more information on whether it will really help.
Not proof, but good enough for me. Also when Germany bans use of neonicotinoid insecticides and they are the home to the company that invented them (Bayer) it raises an eyebrow.