Effects of neonicotinoid pesticide pollution of Dutch surface water on non‐target species abundance
As is, the hypothesis has been confirmed for Diptera, and, less strongly, for Coleoptera, Amphipoda, Heteroptera and Odonata. It was invalidated for Hydracarina, and for the other orders results were ambiguous.
As you can see a September 2010 Dutch study on Neonicotinoid Pesticides does not find an association with Bees
Diptera (true fly) is the intended target.