Importing ash trees from abroad will be banned from today. It is thought they are bringing in disease, and could wipe out native ash trees.
In August, 500 infected trees in Leicestershire had to be removed, because of an outbreak at a car park.
People in the Peak District are being asked to notify park authories if they have planted any ash trees in the past six years.
More worrying developments for the future of the ash trees so many people love.