oak decline en · NOUN
Meanings
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(uncountable) A disease of uncertain origin affecting mature pedunculate oak (Quercus robur) and sessile oak (Quercus petraea) trees in Britain.
More recently, sudden oak death, oak decline, beech wilt, sweet chestnut blight and horse chestnut canker have infested Europe’s forests.
2018, Tim Flannery, Europe: A Natural History, page 296: