Skinning fish or canning fruit brings in the hornets - bad!
So, a simple trap we use is easy to make and works great.
Over a 5gal bucket, we hang scraps - fish skin works best.
At the bottom of the bucket is water, with a bit of dish soap in it.
The greedy buggers load up on food, and often drop into the water where they quickly drown.
After just an hour or so, the bucket starts to make a dent on the pests.