后院 DECK 上有个大马蜂窝, 怎么办?

they will come back again. wait until late fall, for example, late Nov., when they have moved to other places (coz they will NOT live in the same place during winter) , destroy the hive (their home), then spray wasp spray for everywhere, then redo it when it was March 2013. they will not come back again. remember every where, you might use two spray which can cover every where