While it's true that no link has been established between Imidacloprid and Colony Collapse Disorder/Mad Bee Disease, it has been conclusively shown that Imidacloprid is lethal to bees, even at very low concentrations. The only points of contention at this time are whether the concentration of Imidacloprid in the pollen and nectar of various plants is sufficient to kill bees and how vulnerable non-honey bee species (there are thousands of species of bees in North America alone, but almost all the research to date is focused on honey bees) are to the pesticide. The bottom line is, if you care at all about bees, you ought to carefully consider what you put on your plants and why.
