Looking for a cause.
I can see where they are getting in what should I do, anyone had experience in this.
We had similar round here recently, in the base of a lamp post; wasn't discovered until someone rammed in to the lamp post at speed and it took four hours and change to extract them out the vehicle as the bees had to be extracted first.Be glad you do not have this, but at least it is outside:
I thought they got coated in the stuff and took it into the hive to infect others??That unfortunately will only kill the wasps moving around but not the wasps that stay on the nest with the queen. It does help though.
You need something called wasp nest destroyer foam and apply it a few times.
This is the stuff I have Edward... https://www.amazon.co.uk/Centurion-90098-Wasp-Killer-Powder/dp/B00NVKP5WY/ref=sr_1_1?adgrpid=54429808278&gclid=CjwKCAjwvJvpBRAtEiwAjLuRPd3hvVRjxB2AcYXf60bHHDyGIXMzEZqPlGY2U01IJzuQsT4mOc1QvBoCn7IQAvD_BwE&hvadid=259115756139&hvdev=c&hvlocphy=9073569&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=14748811177783275984&hvtargid=kwd-315656926962&hydadcr=5939_1827701&keywords=rentokil+wasp+killer+powder&qid=1562876574&s=outdoors&sr=1-1I believe what you have is like fly killer where it just suffocates them. The stuff I’m talking about does take it into the nest to infect and kill the others.
I have never heard of using a powder, it is always some type of spray. This sounds like what I have always used, it shoots a great distance and if you spray in the entrance it expands inside.There's a foam which can be sprayed from about 8' away that kills the wasp nest - and if you can't hit it directly then the wasps take the chemical to the nest which destroys it (but not in one hit). This dust stuff is fine but not as effective as the foam you can buy.
At the end of the day, if what you have does the job, it doesn't really matter.
It works the same way as killing off Ants, if you put the powder around the entrance of the nest the wasps take the powder inside and kills off the wasps. It's a lot cheaper than the sprays so not common knowledge. By the way I will not kill the bees though as they are not a pest.I have never heard of using a powder, it is always some type of spray. This sounds like what I have always used, it shoots a great distance and if you spray in the entrance it expands inside.