Definition of ash dieback in US English:

ash dieback


  • A serious fungal disease of the European ash, characterized by the progressive death of the tree's branches.

    The disease is caused by Hymenoscyphus pseudoalbidus (also called Chalara fraxinea), subdivision Ascomycotina

    • ‘It has emerged that 100,000 ash trees have already been burnt to stop the spread of ash dieback.’
    • ‘The first outbreak of ash dieback has been confirmed in Northern Ireland.’
    • ‘The threat of ash dieback is mitigated by the vigour with which new trees regenerate in the British climate.’
    • ‘The number of woodland sites where ash dieback has been detected has doubled.’
    • ‘Ash dieback may have arrived in Britain after spores were blown on the wind from continental Europe.’
    • ‘Earlier this week industry, conservation groups and scientists met for a summit on how to deal with ash dieback.’