Woodland Trust on ash trees and dieback disease in UK
The dieback disease "could be the end of the ash tree" and it was unlikely that its spread could be stopped, said Austin Brady from the Woodland Trust.
And he said government action was needed on other "pest and diseases threats" on the UK's borders.
More clips on our BBC website, external; 'like' us on Facebook, external page; follow us on Twitter, external or watch full programmes from the last seven days via BBC iPlayer