Ash dieback fungus confirmed in Carmarthenshire
Wales' first case of ash dieback disease has been confirmed by the Department for Environment, Food and Rural Affairs (Defra).
It was found in a newly planted tree on private woodland in Carmarthenshire but Defra has refused to be more specific.
Some scientists warn the outbreak has the potential to devastate the UK's population of 80 million ash trees.
BBC Wales understands seven suspicious sites had been found in Wales with the results of tests being awaited.
Professor Hugh Evans, head of forest research in Wales, spoke to Tomos Dafydd, who asked him how the disease reached Wales.