BBC: An increasing body of evidence suggests that ash dieback – the disease which has killed trees across Europe and is now in Britain – originated in Japan.
Some scientists say the fungus now ravaging trees across Europe is the same as a native species from Japan.
However, the Asian version of the fungus seems to cause no harm to ash trees there.
Researchers speaking to the Radio 4 programme The Tree Scientists described the misidentification of the fungus.
Recent figures from the Department…

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