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Deadly disease threatens to devastate ancient woodland

25 October 2012 Last updated at 14:09 BST

A disease that has the potential to devastate the UK's ash tree population has been recorded for the first time in the UK's natural environment.

Chalara dieback, caused by a fungus called Chalara fraxinea, was confirmed at two sites in East Anglia.

Until now the disease had been recorded only in a few nursery specimens.

Ben Ando reports from Norfolk, one of the two areas where the disease has been found.