The Woodland Trust confirmed that ash dieback has been found in both mature ancient woodland and woodland creation areas on its estate at Pound Farm in Suffolk.
Infected ash trees have also be identified at Norfolk Wildlife Trust's Lower Wood reserve, Ashwellthorpe. In the UK, ash trees make up around 30% of the wooded landscape, across woodlands, hedgerows and parks.
The Forestry Commission is suspending the planting of ash trees in public forests it manages and the Woodland Trust is supporting a ban on importing and moving ash trees in a bid to stop the disease becoming established in the UK, which the Government is poised to bring in as early as next week.
More top news
A summary of the key announcements from Chancellor George Osborne's Autumn Statement and Spending Review.
All cuts have consequences, warns Joel Hills, as he examines which assets may be up for sale if George Osborne decides 'everything must go'.
Tests revealed she was suffering from secretory carcinoma - which affects just "one in a million people" diagnosed with the breast cancer.