My MIL (mother in law) is RABID about Japanese beetles and her plants... She got traps similar to yours David and man oh man... full of the little buggers.... She even bought the traps for me and my brother in law (BIL? LOL) They did eat the hell out of one of my trees but I wasn't that worried about it. Especially since we had that stretch around 100 degrees here for a week I really haven't noticed the little buggers that much....
Bees however...
Execute as many as ya can.... yellowjackets love to nest in the timberwall next to my garage. And unlike wasps they are NOT kind when you get near them... Wasps generally ignore you if you live there... (nest in my shutters near my back slider, totally leave us alone) Yellowjackets however just suck... I see em' I kill... (yeah they got me GOOD last fall....)
Ize