We had a real big problem late spring/early summer, they were all over my wood supply up the back of my house and would buzz all around me when mowing the lawn.
I did heaps of research and found a few things to sort the buggers out.
Firstly I bought a wasp trap from farmlands, the baits they have there didn't work but this one from Bunnings was brilliant.
Once I started using this in the trap I was empting up to 300 wasps out of it in 2 days.
Another great killer was a big plastic fish tub filled close to the top with water and a few quirts of dish washing liquid mixed in, then get a strip of wood, lay some raw chicken strips down the centre of the wood (not too close to the sides) and turn it upside down just above the water line allowing just enough space for the wasps to fly under the wood and get some of the chicken, once they try to fly off they drop altitude and fall in the water with dishwashing liquid and they float around until they drown. The dishwashing liquid affects their wings and their ability to fly so they just drown.
I was way up over 2 thousand trapped and drowned before the counsel found the nest and killed them all.
Look the fish tub trap up on youtube, Americans use them and they are massive killers of wasps and you don't get any bees.
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