Well, the thing that baffles me is this: I'm under the impression this kind of thing is pretty much unpredecented.
I mean, if it was a warmer winter with cold evenings or the like, someone would have already had noticed back then; after all we did have had some odd weather without any help from global warming where we saw unseasonally warm temperatures or maybe snow in what usually are warm months.
Same would apply if we were talking about parasites or viruses; we'd surely would have had observed a similar effect earlier.
I'm not 100% sure if I understood this but it looks like this is first time commerical beekeepers starting moving their hives fields to fields; if that is the case, I'd think that alone would be culprit.
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