Re: Attacking bees - not africanized
Yep, I imagine AHB would definitely not be a problem up there in BC!
There's just not enough information to determine the cause yet. Work em a bit, and find out if they're more aggressive in general now. If not, I don't know - maybe the pigs accidentally made them angry for some reason; but if so, you've just got yourself a statistically-inevitable hot hive.
Nucs are mostly young nurse bees and brood, yes? Not a lot of foragers or guards. If it's a hot hive, maybe that's why they seemed gentle at first, and now you are learning the ghastly truth. A new queen will satisfy the situation.
Beeless since 2012; coming back in 2014. Suffering from apicultural withdrawal!