We do known that Clothianidin caused the bee deaths in Baden-Württemberg (Germany) in 2008[1], which led to a ban for corn seeds[2].

[1] http://idw-online.de/pages/de/news264587 (press release by Julius Kühn institute, German)

[2] http://www.gesetze-im-internet.de/maispflschmv/BJNR502300009... (neonicotinoid ban for corn seeds, German)