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(Image: GETTY)

The vicious insects are causing havoc at summer picnics and barbecues after getting tipsy on rotten fruit.

The 'worker' wasps are most dangerous because they are racked with boredom at this time of year, according to pest control bosses.

Paul Bates of Cleankill said: "Worker wasps have finished their life's work as queens have stopped laying eggs and don't need food bringing to them.

"This means the workers are free to go out and enjoy themselves, which includes stealing meat from the barbecue."

(Image: GETTY)

Their numbers have swelled this summer thanks to the mild winter and dry spring.

The grumpy wasps are native to Britain – despite their name – and far more dangerous than common wasps.

Bates warned Brits, particularly kids, to keep clear of nests – or risk "excruciating" stings.

A cafe at a popular tourist attraction has even been forced to put up a sign apologising for the pests.

Edward Hill, manager of the Bentley Wildfowl & Motor Museum, said: "We've got wasp traps everywhere.

"It's a big problem for us because they come after our jam and marmalade."