I have a similiar problem as of this moment. I planted some bee mines in a field and when the pigmen activated they spawned tons of bees that now lag the west side of my base. I've taken to burning down all my berry bushes and saplings to cull the population but to very little avail. Right now I'm considering destroying my bee boxes and am currently using pigmen to wage war on the bee. Is there any other way to extermine these vermin?