Around here, using conventional counter attack methods, only when they absolutely must to go, and it's a nice hot saturday afternoon, there's a no vacancy sign on the nest, and it's just as plumb full of wasps as it gets for the year, have no fear, just take a long stick and do poke well, actually though, one harrassing jab will suffice, don't go after it like a pi~nata ! That is of course, AFTER handing out the tennis rackets! Now to be in the game you cannot be allergic and you must have a really quick, and accurate swing, sharp eyesight. In the nuclear, biological, chemical department, basically anything that's in the garage in an automotive, solvent type aerosol gets preference, although just about anything that come out of a rattle can will do a number on em. Also in the small arms department, older air type guns, ones you can pump up lightly, do wear eye safety protection, actually don't try this, but for the larger targets like bumble bees, it does work well if you are a good shot.
Using green technology, a high presssure hose nothing less than 5/8" dia garden hose, does wonders on em too. Incendiary department, well if it's a non combustible thing like ad old bulldozer blade they're in, then fill the compartment with safe amount of flammable vapor, (you know how that goes, always too much) a quick shot of ether will do, have seperate source of ignition ready, well don't try this either. I do like the ones that go down in a trail of smoke. Well, we had fun as kids, still do the tennis racket thing once in awhile, the yellow paper wasps here are not too aggressive, they bumble around fly in out, you don't get stung, it's hard to nail em too. Your local species may vary in agressiveness, study em first, helps a lot when they have to go.
And, for the most part, if they're around and not on or in something that I need to get on or in, or pose no hazard to anyone, I just leave em bee ! I do notice many kinds of bees around the garden and anything that flowers, fruit trees, ok if they're not a problem.
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