Paul Bates, boss of pest control firm Cleankill, warned people should look out for the wasps while out, especially when enjoying barbecues or picnics.
He said: “Up until mid-August workers provided food for the larva in the nest, but once the queen stops laying eggs there is no longer any need for food in the nest so the workers go out to have a good time.
“They feed off BBQ scraps on plates and on fallen fermenting fruits that are in abundance at this time of year.
“The type of wasp causing most problems is the German yellow jacket which gives a particularly painful sting.
source: express.co.uk