It's been confirmed that a case of the disease Ash Dieback has been discovered in newly planted trees in the West Country.
The Forestry Commission says the Chalara fraxinea fungus has been found near Bristol.
It was on a site that had been recently planted and they say the infection will remain contained. The disease has so far spread to 65 woodlands across the country.
The government has imposed an import ban on ash trees, and a nationwide survey is being carried out to find out how far it has spread.