PEST control experts have issued a warning after a University of Reading study identified a surge in poison-resistant rats.

The report revealed a new generation of rats carrying a genetic mutation, which makes them resistant to conventional poison.

The British Pest Control Association (BPCA) says it is more important than ever to ensure proper protection is in place in order to avoid unwanted rodents in homes and businesses.

Dee Ward-Thompson, BPCA technical manager, said: “The study highlights the fact that resistance is growing in rat species across a swathe of the country.

“It also reports that rats without the genetic mutation are being killed off by poison, so the resistant species are taking their place, leaving a growing population of resistant pure-breds.

“The clear message is that to be effective in tackling this issue people should not attempt to self-treat rats.

“With their numbers expanding there could be a significant risk to public health if their population is left unchecked, in both urban and rural environments.”