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.