> (g) It works like a champ against N. apis, and has yet to result in "resistant strains" despite decades of use, including all possible misuses.

You have no basis for this statement. In fact, fumagillin has been implicated as contributing to the near universal replacement of N. apis by N. ceranae. But beyond that, the taxonomy of Nosema spp is far from clear. What constitutes species divisions, variants, etc. is currently being debated. 

Can you tell the difference between N. apis, N. ceranae, N. bombi, N. bombycis, etc.? Do you know how it is done? These are very aggressive organisms, fully capable of mutating and exchanging genetic material. Add antibiotics to the mix and you create a recipe for the generation of newer more virulent forms. 

PLB

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