My brother n law had a problem with yellow jackets,he lit the hole and ground beside them,went off like a little bomb,,he burned the yard around them and put it out with a hose pipe.2 days later he got a call,,the fire burned dry roots and ''slow'' burned under ground until it reached above ground,then burn above ground,he said the fire department put it out before it burned the neighbors building up :-D
I had a problem with yellow jackets and hornets near my hives,I made a bottle simaliar to the one pictured,,but I only used one bottle,,I like the idea of the doubled bottles..I cut 1/2 holes near the bend of the neck,filled it a third full with apple cider vinager,water,and banana peels,it worked ok,,caught hornets and yellow jackets,no honey bees to date.
When I found the nest I bought a bottle of amonia,at the dollar store for $1,,drilled a 1/4 inch hole in the lid,put a 1/4 inch tubing,3 feet long,,(a clear gas line tube)--I slid the tube in the entrance of the nest(s) and held the bottle upside down,20 seconds later they crawled out coughin and staggerin.. ;)
I also did it to hornets in a crack in a block wall,,the hornets kept attacking my bees.The gaurd hornet ran into the hive once the tube went in warning the others,by the time he and his buddies started out the hole,they were gasping for air.I stood agaist the wall holding a half gallon of ammonia up letting it slowly drain into the entrance.Works great,,been a year and hadnt seen any hornets return.