Acute Oak Decline: Disease attacking ancient trees
16 July 2013 Last updated at 11:43 BST
A disease which attacks mature oaks is wiping out ancient trees across the eastern region.
More than £1m is being spent on research into Acute Oak Decline but it comes too late to save badly affected trees on the Glemham House Estate, in Suffolk.
Scientists believe a beetle may be responsible for the disease. They are also trying to isolate and identify a bacteria found on the dying trees that might be linked to the infection.
Little is known about the rate of spread of the disease and whether all oak trees are at risk.