Make wasp catcher from plastic bottle. Cutting through half the bottle. Put the upper portion (with orifice), reversed in the lower part. Put some sweet liquid in and go!
I tried the wasp catcher on advice from grandma to the animals nowadays are smarter than the time grandma. They're just there again, but with a full belly! The solution was simple: Add in the diet also encourage some methylated spirits. Drunk they fall or in the cola and drown.