单词	dieback
释义	dieback /ˈdʌɪbak / noun [mass noun] A condition in which a tree or shrub begins to die from the tip of its leaves or roots backwards, owing to disease or an unfavourable environment: any sign of browning or other discoloration could be the onset of dieback aluminium causes the stress condition of crown dieback a survey of hedgerow trees found a correlation between ash dieback, acidity, and sulphur... The tree seems to be experiencing dieback similar to fire blight. If a shrub develops dieback, prune out infected parts. The caterpillars of the gypsy moth are destructive defoliators that feed primarily on oak trees causing growth loss, crown dieback, and tree mortality. Rhymes tieback
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