Here is a statement which supports your contention.
> the abundance of American bees, bumblebees, moths, hoverflies and other wild insects has fallen dramatically, according to the national census of the insects.
http://ohotypest.wordpress.com/2014/02/16/bee-devastation-campaign-for-total-ban-of-neonicotinoid-pesticides/
Typically, there is no way to verify the statement as no link to "the national census of the insects" is provided. I can't find any such census, though no doubt it would be enlightening.
PLB
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