Forestry staff at The National Forest are issuing precautions to people visiting the 200 square miles of woodland across Staffordshire, Leicestershire and Derbyshire.
The Forest is so far free of ash die-back but it has already been found in Shropshire, Lincolnshire, Leicestershire and Warwickshire.
The CEO of the National Forest, Sophie Churchill, is urging people to wash shoes and boots when returning from walking in the woods.
There are more than a million ash trees in the Forest and any infection could be devastating, especially as the forest has only been established for twenty years.There's more information at www.forestry.gov.uk
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.