Thing is, while the research is ongoing we are taking the default dangerous route of letting neonicitinoid still be used which seems totally back-to-front to me when the consequences could be so severe.
With new chemicals that have concerns like this I would have thought a "guilty until proven innocent" approach would be more advisable.
Last thing we want is "Oh yes it was that stuff, sorry about that, any bees left?"
It's the second paragraph of a NY Times article. Such things don't tend to embed supporting evidence along with claims, but it's usually a good indicator that there is supporting evidence.
Specifically the statement says one kind of pesticide "could be" an important "contributing factor". It's no smoking gun.