The Royal Horticultural Society (RHS) is urging gardeners to stay alert for the fast-breeding brown marmorated stink bug insect, after a new warning suggests it may become more widespread.

The large, oval-shaped insect – which has been spotted in three places in England so far — could appear alongside more familiar pests such as slugs, snails and the box tree caterpillar in the coming weeks.

While they aren't known to bite humans or damage property, they can cause harm to plants, fruit trees and farm crops. As well as damaging our favourite flowers, their foul odour can become incredibly overpowering when they enter a home (it's part of their defence mechanism).

"With gardens taking on a more important role in supporting wellbeing and the environment, it's important that research into management and mitigation of them continues and our rankings help inform this focus," Andy Salisbury, principal entomologist at the RHS, told the BBC.

"It's also imperative that we continue to anticipate future threats such as the disease Xylella, which is already present in Europe, and the marmorated stink bug, to protect our gardens for the future."

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Max Barclay, an insect curator at London's National History Museum, predicts that the brown creature could establish itself around the South East of England, spreading further with climate change.

"The brown marmorated stink bug is very similar to many harmless native species, so we hope people won't go out and start squashing everything similar!" he added. "We are only trying to determine how widespread it is at this stage, and we are happy to identify specimens sent to the museum's facebook group or via email.

Other pests to keep an eye out for include slugs and snails, the vine weevil, and the box tree caterpillar.

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Lisa Joyner
Deputy Daily Editor, Country Living and House Beautiful

 Lisa Joyner is the Deputy Daily Editor at House Beautiful UK and Country Living UK, where she's busy writing about home and interiors, gardening, dog breeds, pets, health and wellbeing, countryside news, small space inspiration, and the hottest properties on the market. Previously, she has written for Conde Nast Traveller, House & Garden and Marie Claire magazine. Lisa studied at University For The Creative Arts, where she completed a BA in Fashion Journalism.