Psssst, wanna know a cheap lil secret about ALL wasps, yellow jkts, hornets etc??? My grandad taught me decades ago that simple soapy water KILLS THEM GRAVEYARD DEAD! Now I'm not an Entomologist but I think I've been told that those types of bugs breath thru their bodies somehow & the soapy water does two things. 1). It coats their wings & makes them unable to fly so they hit the ground instantly. 2). Because of that "breathing thru their skin", that coat of soapy water on their body essentially drowns them on contact.

Get a plastic quart squirt bottle, put a couple of teaspoons of dish washing liquid in it, fill it with water & "go huntn"!

Another way I've gotten rid of those late fall/early winter masses/clumps of wasps is to mix a whole 1gal pitcher of water/soap & use the "shotgun" approach with it. The whole thing at once on a large mass of bugs!

& yes, wait til dark to get ALL of them at a particular spot. Plus they can't see or fly very well in the dark so there's very little chance of them defending against or coming after you then!

Been doing it for years, saved LOT$ of money & don't have to worry about breathing or getting those chemicals allover you!