this is an ad
if all else fails there's always the wasp traps at Home Depot.
i've had significantly better luck with the one is a plastic bag over the more expensive platics tube with a cone inside.
i was trollind aroung OT and came across this.
don't know if it'll work... but here goes.
http://alaskaoutdoorjournal.com/Departments/Tips/yellowjacket50.html