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Drought is also thought to be a factor causing dieback in hedgerow trees, which are not included in the UK crown density survey.
A whole plant showing dieback was sent to CSL for diagnosis.
In North America it also causes ramorum dieback or ramorum leaf blight on a range of woodland plants.
This forest dieback or degradation could potentially contribute 10 to 100 Gt C to the atmosphere in the coming century.
The other problem affecting alders is crown dieback, which results in the tree dying from the top downwards.