'Betty' the ash tree offers hope against deadly dieback disease

Scientists identify first tree to show strong tolerance to the disease raising hopes of developing a resistant strain

She has a silver-grey trunk, is 200-years-old and unusually resilient. Betty, a mature ash tree in Norfolk, is offering hope that ash dieback disease will not be as destructive as first feared after scientists identified her "strong tolerance" to the disease.

Researchers from a government-backed consortium of universities and research centres have developed three genetic markers to enable them to predict whether a tree is likely to be tolerant to the disease, raising the possibility of using selective breeding to develop strains of disease-resistant trees.