Ash dieback , an incurable tree disease , has been detected in the UK . It threatens Britain 's 80 million ash trees , the fourth most abundant tree in the world . A smartphone app called Ashtag is providing a way for the public to identify diseased trees . More than 100,000 trees have been destroyed in efforts to stop its spread .
Ash dieback , an incurable tree disease , has been detected in the UK . It threatens Britain 's 80 million ash trees , the fourth most abundant tree in the country . A smartphone app called Ashtag is providing a way for the public to report diseased trees . More than 100,000 trees have been destroyed in efforts to contain its spread .