ash dieback (uncountable)
- (phytopathology) Dieback of ash trees caused by the fungus Hymenoscyphus fraxineus.
2023 August 9, Mel Holley, “Network News: Scotland's £4.2bn plan to ensure network stability”, in RAIL, number 989, page 24:Ash dieback is a major concern. Only ten years after its identification in the UK, the risks posed by dead and diseased trees is rising, says NR. In 2020, ash dieback was present in 73% of ash trees in England, 92% in Wales, and 21% in Scotland, with a rapid increase in tree mortality rates over the next six years expected.
