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Signals from mobile phones could be partly to blame for the mysterious deaths of honeybees, new research shows.

In the first experiment of its kind, a bee expert placed a mobile phone underneath a hive and then carefully monitored the reaction of the workers.

The bees were able to tell when the handsets were making and receiving calls, and responded by making the high pitched squeaks that usually signal the start of swarming.

Dr Daniel Favre, who carried out the experiment, believes signals from mobile phones and masts could be contributing to the decline of honeybees and called for more research.

But British bee experts say there is still no evidence that mobile phones posed a risk.

They blame the vanishing honeybees on changes in farming, the decline of wild flowers and pesticides.

The number of honeybees in the UK has halved in the last 25 years while in America bees have been badly hit by ‘colony collapse disorder’ – the sudden disappearance of entire colonies over winter.

Experts say bees have been badly hit by the varroa mite, a blood-sucking parasite that makes colonies vulnerable to disease, freak weather or poisoning.