If you have a hole/nest in the ground where you can see the entry sprinkle NO MORE WASPS powder around it at night. Alternatively a 1.5 litre coke bottle of petrol jammed into the hole and left for a couple of days has worked for me in the past.
Vespex is absolutely amazing but from what I know it can only be used at certain times of the year when wasps are feeding on protein.
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