That's cool, in a "better living through chemistry", 1950s man-in-a-white-labcoat sort of way. But when it comes to this stuff, I tend to be a bit like Ian Malcolm in Jurassic Park: they're so focused on whether they could, that they never considered if they should.

Probably the better solution here is to stop trying to do industrial farming of bees, and move to a system where local populations of pollinators are cultivated and maintained year round. But sure, RNAi is probably better than the chemicals they're using now.