I've been chased away from my wood stacks too many times over the last week or two, and summer is just beginning. No way can I put up with these hateful bastards all summer, with mowing around the stacks, and such.
How to eradicate a yellow jacket nest from your stacks? I might be calling an exterminator on this one.
... and the obvious follow-up: how to prevent them from going to our stacks, in the first place?
You don't need powerful pesticides to deal with this. Safer brand has a non-toxic (to anything but wasps) spray and there are store brand sprays that use the same ingredients. I have various wasp problems every year, and I use the Agway brand for them. They work fine and the residue is no problem to burn.
You need to figure out where the nest is first. When I had this problem a few years ago, I went some distance away in late afternoon with my binoculars and watched to see where the yellowjackets were going in and out. Didn't take long to find the entrance hole on the bottom of a stack.
Then comes the scary part. *Wait until dusk* when the insects are logy and mostly inside, cover your exposed skin with gloves, a turtleneck sweater, long sleeves, long pants, socks, tall rubber boots, a hat, a balaclava or ski mask if you have one, get some cheap plastic goggles at the hardware store, throw a scarf around your neck, etc. You'll look totally ridiculous to the neighbors, but you'll be less likely to get stung and you'll feel less vulnerable and therefore less rushed when you tackle the job.
Get a bead on that entrance hole, sneak up on it slowly and blast the bejesus out of it with the spray, a good long blast. (Those cans can shoot a good 15 or 20 feet) and then back away slowly and get out of there-- slowly. Yellowjackets go after moving things.
Then go observe carefully the next day and see if there's any activity. In my case, happily, zero yellowjackets flying around. When I took down the stack carefully, I found the enormous nest on the ground underneath and the huge number of insects was just stunning-- all dead.
.If you've still got YJs, start over and look for another entrance hole, then treat it the same as the other one.
If you've still got them, give up and call an exterminator. But don't pay somebody to deal with this for you until you've tried the DIY with the spray.
I don't think there's any way to prevent this, but I only had the problem that once 6 or 7 years ago and it hasn't happened again.