sentences:  In 2009, the German Federal Office of Consumer Protection and Food Safety decided to continue to suspend authorization for clothianidin use on corn.It had not yet been fully clarified to what extent and in what manner bees come into contact with the active substances in clothianidin, thiamethoxam and imidacloprid when used on corn.The question of whether liquid emitted by plants via guttation, which bees ingest, posed an additional risk was unanswered.