The number of sites in Scotland confirmed as having a disease threatening to devastate the UK’s ash trees has risen to 23.

Chalara ash dieback has been found at one nursery, 18 recently-planted sites and in four further areas.

Scottish Environment Minister Paul Wheelhouse, who confirmed the figures, said work was being done to combat the fungal disease.

Chalara ash dieback is affecting a total of 241 sites across the UK.