Insecticide to prevent wasps?

I say it every year and every year I get downvoted as though it doesn’t actually work. Lambdastar Ultracap 9.7 is what you want to “prevent” wasps. Spray it on every surface around your property. It lasts for up to 12 weeks on surfaces protected from rain and up to a week or two on surfaces not protected from rain. Wasps land on it (and every other insect for that matter) and they die a day or two later. I spray down my home’s exterior walls, eaves, and and window screens with it a couple times a year and I hardly ever find a wasp nest. I used to have tons of them but since starting this regimen, very few. It works.

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We spray talstar (bifenthrin)

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I've had very good luck doing this as well. eaves/overhangs and around porch light fixtures. Window openings as well on the brick. All the usual spots and no wasps for most of the season. I try to do it around now before they have a chance to set up nests. It's also much easier to spray the areas when you don't risk getting tagged.

Talstar kills everything. This is your best bet

Demon WP is very good stuff. has a little more knockdown power than talstar. The two are a great combo as cypermethrin is a great eradicator, while bifenthrin has alot longer residual.