Comment Re:It's not limited to the US (Score 4, Insightful) 220
Australia uses the neonics differently, as I recall. Something about the way they spread the pesticide makes it less likely to interfere with bees.
That said, it's an insecticide. It's meant to kill insects, and they're generally pretty indiscriminate. It's also fairly likely that even if it's a sub-lethal dose for bees, it's a lethal dose for different beneficial insects.
I think there are multiple causes--varroa mites have been around for decades without causing such widespread colony collapse. We've got a changing climate and agricultural monocultures, as well as stress from neonics (which it turns out honeybees may prefer over non-treated nectar).
Looking for single causes is usually hopeless. But we can control our use of pesticides, so it's one of the things on the chopping block. One way or another, we have to bring this problem under control.